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Would this black hole cause the universe to collapse? Hard to say. The answer depends on what the deal with dark energy is, and nobody knows what the deal with dark energy is. The following is an excerpt from How To: Absurd Scientific Advice for Common Real-World Problems, a new book from cartoonist and science communicator Randall Munroe.How To is available on Amazon here But now we have a problem. What happens if light goes back from point C toward the lens? Optical systems are reversible, so the light should be able to go back to where it came from—but how does the lens know whether the light came from B or to A?Lenses and mirrors work for free; they don't take any energy to operate.[2]And, more specifically, everything they do is fully reversible—which means you can add them in without increasing the entropy of the system. If you could use lenses and mirrors to make heat flow from the Sun to a spot on the ground that's hotter than the Sun, you'd be making heat flow from a colder place to a hotter place without expending energy. The second law of thermodynamics says you can't do that. If you could, you could make a perpetual motion machine.

Maybe you can't overlay light rays, but can't you, you know, sort of smoosh them closer together, so you can fit more of them side-by-side? Then you could gather lots of smooshed beams and aim them at a target from slightly different angles. A few of my favorites: * What happens when a Baseball is pitched at 90% of the speed of light? Apparently a lot of things not limited to atomic fusion, generation of plasma and a substantial atomic blast. * How can you make a jetpack by using.. Speaking of XKCD, Randall Munroe has a new NY Times column called Good Question where he answers odd science questions (a la What If?). The first installment: If I Touched the Moon, What Would It Feel Like? Moon dust may not burn you, but it's no picnic xkcd: volume 0 is the first book from the immensely popular webcomic with a passionate readership (just Google xkcd meetup). The artist selected personal and fan favorites from his first 600 comics It takes a list of ages and genders and produces various statistics. Here's the report for the nine living people who have walked on the moon: ~$ python actuary.py 81m 82m 80m 81m 80m 81m 76m 78m 77m There is a 5% chance of someone dying within 0.08 years (by 2012). There is a 50% chance of someone dying within 1.1 years (by 2013)

Randall XKCD Munroe has a New York Times column where he answers weird science questions. If I Touched the Moon, What Would It Feel Like? Touching lunar rocks inside a spacecraft, or in a. NASA assigned 32 American astronauts to the Apollo lunar landing program, and 24, flying on nine missions between December 1968 and December 1972, orbited the Moon.During six two-man landing missions twelve astronauts walked on the lunar surface, and six of those drove Lunar Roving Vehicles.Three flew to the Moon twice, one orbiting both times and two landing once apiece If everyone on earth aimed a laser pointer at the moon, would we see it change colour? Randall Munroe, creator of the webcomic xkcd, talks us through the laser light calculations - and concludes. A [[wikipedia:blood moon|blood moon]] refers to the moon during a lunar eclipse.\n:*While the popularity of '''skinny jeans''' ([[wikipedia:Slim-fit pants|slim-fit pants]]) does change over time, the idea that this is connected to a lunar cycle is also a joke.\n:*Finally, while the idea of a '''total eclipse of the sea''' seems absurd, [https. home rmosco 2019-12-11T17:44:31+00:00

Removed text that reads like a personal comment in the Title Text section: "And that is terrible to hear in the image text that we haven't been more than half an inch from the surface of the Earth if it were the size of a basketball. Personally, I'm putting most of my hope in Space X. With most of the NASA layoffs, a lot of the people went over to Space X. (A private company dedicated to space travel founded by former eBay founder Elon Musk.) I think they (or another private company) are the only hope of getting back into space and permanently this time." Frijole (talk) 21:30, 10 September 2013 (UTC) When you do finally enter the atmosphere, you'll be coming down near the edge of the tropics. Try to avoid the tropical jet stream, an upper-level air current which blows in the same direction the Earth rotates. If your pole happens to go through it, it could add another 50-100 m/s to the wind speed.

xkcd: Shoot for the Moon

Ok, let’s mount a megawatt laser on every square meter of the surface of Asia. Powering this array of 50 trillion lasers would use up Earth’s oil reserves in approximately two minutes, but for those two minutes, the Moon would look like this:Everything else would be different and way cooler. The waves would be bigger, the splash fights more intense, and swimmers would be able to jump out of the water like dolphins.

Except lenses don't concentrate light down onto a point—not unless the light source is also a point. They concentrate light down onto an area—a tiny image of the Sun.[4]Or a big one! This difference turns out to be important. To see why, let's look at an example: Randall Munroe (Author) 4.8 out of 5 stars 774 ratings. See all 7 formats and editions. Hide other formats and editions. Audible Audiobook, Unabridged. $14.99 Read with Our Free App. Free with your Audible trial. $16.69 41 Used from $10.31 47 New from $14.95 2 Collectible from $59.79. $23.10 4 Used from $15.75 6 New from $20.70. Great on Kindle

Subtitled 'Serious Scientific Answers to Absurd Hypothetical Questions', this book is as entertaining as it is informative. The author is at pains to inform readers that, although he has a degree in physics, he works as the owner/creator of a webcomic, XKCD, he also warns that he is less interested in health and safety than in exploring how. Ok, so Spirit and Opportunity are pretty awesome. And Kepler. And New Horizons, Cassini, Curiosity, TiME, and Project M. But c'mon, if the Earth were a basketball, in 40 years no human's been more than half an inch from the surface Plus, all you've got at this point is more than 168 million rockets full of trash in Earth orbit. To get them from there to the sun, you need to multiply the cost by at least 10. There you go, you. It makes sense, though. Sunlight bathes the Moon in a bit over a kilowatt of energy per square meter. Since the Moon’s cross-sectional area is around 10^13 square meters, it’s bathed in about 10^16 watts of sunlight—ten petawatts, or two megawatts per person—far outshining their five milliwatt laser pointer. There are varying efficiencies in each part of this system, but none of it changes that basic equation.

xkcd: Moon Landin

  1. In real life, we can't put a metal pole between the Earth and the Moon.[1]For one, someone at NASA would probably yell at us. The end of the pole near the Moon would be pulled toward the Moon by the Moon's gravity, and the rest of it would be pulled back down to the Earth by the Earth's gravity. The pole would be torn in half.
  2. If you put 1052 electrons together—to build a Moon—they push each other apart really hard. In fact, they push each other apart so hard, each electron would be shoved away with an unbelievable amount of energy.
  3. g underwater would also feel pretty similar. The inertia of the water is the main source of drag when swim
  4. The Moon's top speed stays pretty constant, but the lowest speed rises and falls with an 18.9-year cycle. The lowest speed of the next cycle will be on May 1st, 2025, so if you want to wait until 2025 to slide down, you can hit the atmosphere when the pole is moving at only 390 m/s relative to the Earth's surface.
  5. ..I saw it somewhere on LJ. Could someone point me in its direction
  6. Under those circumstances, it turns out Earth still catches fire. The reflected light from the Moon would be four thousand times brighter than the noonday sun. Moonlight would become bright enough to boil away Earth’s oceans in less than a year.

xkcd: Dorm Poste

Even though the end of the pole is moving slowly relative to the Earth as a whole, it's moving very fast relative to the surface.The most powerful laser on Earth is the confinement beam at the National Ignition Facility, a fusion research laboratory. It’s an ultraviolet laser with an output of 500 terawatts. However, it only fires in single pulses lasting a few nanoseconds, so the total energy delivered is about equivalent to a quarter-cup of gasoline.In the case of an electron Moon, the energy from all those electrons pushing on each other is so large that the gravitational pull wins, and our singularity would form a normal black hole. At least, "normal" in some sense; it would be a black hole as massive as the observable universe.[6]A black hole with the mass of the observable universe would have a radius of 13.8 billion light-years, and the universe is 13.8 billion years old, which has led some people to say "the Universe is a black hole!" (It's not.)

xkcd's Randall Munroe on How to Mail a Package (From Space) The Apollo program sent seven teams of astronauts to land on the moon. Each crew carried, among other things, a suitcase-sized. Regardless of where you come down, you'll need to contend with supersonic winds, so you should wear lots of protective gear.[15]For aerodynamic reasons, this gear should probably make it look like you're wearing a very fast airplane. Make sure you're tightly attached to the pole, since the wind and various shockwaves will be violently battering and jolting you around. People often say, "It's not the fall that kills you, it's the sudden stop at the end." Unfortunately, in this case, it's probably going to be both.[17]If it helps, people have survived supersonic ejections before—and even a supersonic aircraft disintegration—so there's hope.35 miles per hour doesn't sound bad. Unfortunately for you, the Earth is also spinning,[11]I mean, unfortunately in this specific context. In general, the fact that the Earth spins is very fortunate for you, and for the planet's overall habitability. and its surface moves a lot faster than 35 mph; at the Equator, it can reach over 1,000 miles per hour.[12]It's common knowledge that Mt. Everest is the tallest mountain on Earth, measured from sea level. A somewhat more obscure piece of trivia is that the point on the Earth's surface farthest from its center is the summit of Mt. Chimborazo in Ecuador, due to the fact that the planet bulges out at the equator. Even more obscure is the question of which point on the Earth's surface moves the fastest as the Earth spins, which is the same as asking which point is farthest from the Earth's axis. The answer isn't Chimborazo or Everest. The fastest point turns out to be the peak of Mt. Cayambe, a volcano north of Chimborazo. And now you know.​[13]Mt. Cayambe's southern slope also happens to be the highest point on Earth's surface directly on the Equator. I have a lot of mountain facts.

1446: "Landing" - Page 12 - xkcd

Laser Pointer - xkcd

So maybe the next step, if you really want a swimming pool on the Moon, is to call Elon Musk and ask for a quote. Again, it is odd that the capacitance between the Earth and Moon is not dependent upon the Moon's orbital radius, but that is the answer. To do this problem exactly requires you to integrate the electric field between the Earth and Moon over any path between them then divide this voltage into the charge that you used to create the field

xkcd Mnemonics Sailor Moon's head exploded once' and 'Some men have explosive orgasms' both work for the Great Lakes from west to east (Paddle-to-the-Sea order). This quintessential XKCD -- lots. But it gets even better. A 2012 paper in PLoS ONE, titled Humans Running in Place on Water at Simulated Reduced Gravity, concluded that while humans can't run on the surface of water on Earth,[5]They actually provide a citation for this statement, which is delightful. they might just barely be able to do so on the Moon. (I highly recommend reading their paper, if only for the hilarious experimental setup illustration on page 2.)

Proton Earth, Electron Moon - xkcd

  1. The Moon's orbit is tilted by about 5° relative to the Earth-Sun plane, while the Earth's axis is tilted by 23.5°. This means that the Moon's latitude changes the way the Sun's does, moving from the northern tropics to the southern tropics twice a year. However, the Moon's orbit is also tilted, and this tilt rotates on an 18.9-year cycle.
  2. Luckily, that's not the end of the story. Remember how we're ignoring general relativity? Well, this is one of the very, very rare situations where bringing in general relativity makes a problem easier to solve.
  3. Then, at last, you can drift safely to the ground, having traveled from the Moon to the Earth completely under your own muscle power.
  4. Eventually, as you reach the vicinity of the L1 point and are no longer fighting gravity, the only limit on your speed will be how quickly you can grab the pole and "throw" it past you. The best baseball pitchers can move their hands at about 100 mph while flinging objects past them, so you probably can't expect to move much faster than that.
  5. Warning: this comic occasionally contains strong language (which may be unsuitable for children), unusual humor (which may be unsuitable for adults), and advanced mathematics (which may be unsuitable for liberal-arts majors)

Dr. Keeler agreed that we shouldn't rely on any calculations that involve putting that much energy in each electron, since it's so far beyond what we're able to test in our accelerators. "I don't trust anything with energy per particle over the Planck scale. The most energy we've really observed is in cosmic rays; more than LHC by circa 106, I think, but still not close to the Planck energy. Being a string theorist, I'm tempted to say something stringy would happen—but the truth is we just don't know."As you approach the L1 point, you'll start to be able to switch from climbing to pushing-and-gliding: You can push once and then coast a long distance up the pole. You don't have to wait to stop, either—you can grab the pole again and give yourself a push to move even faster, like a skateboarder kicking several times to speed up. Serious Scientific Answers to Absurd Hypothetical Questions is a collection of many of the blog's most popular answers, along with brand new weird and wonderful questions. Available now in the US! Scroll down for international pub dates. The World Out now and coming soon from publishers worldwide You may not recognize the name, but chances are you’ve seen one in operation: It’s the searchlight mounted on police and Coast Guard helicopters. With an output on the order of 50,000 lumens, it’s capable of turning a patch ground from night to day.At the top of the Luxor Hotel in Las Vegas is the most powerful spotlight on Earth. Let’s give one of them to everyone.

Earth-Moon Fire Pol

Worldbuilding Stack Exchange is a question and answer site for writers/artists using science, geography and culture to construct imaginary worlds and settings. and the Moon sent off into space. The obligatory XKCD comic is here. So nuclear weapons are not going to cut it, but some far future terrorists might be able to hijack a solar mirror. Moon Shapes via xkcd.com Posted on infosnack We’re also drawing five petawatts of power, which is double the world’s average electricity consumption.

Note: While you're flinging yourself along, be careful not to drift out of reach of the pole. Hopefully you brought some kind of safety line so you can recover if that happens.Assuming you descend slowly and enter the atmosphere in a controlled manner, you'll soon encounter your next problem: Your pole isn't moving at the same speed as the Earth. Not even close. The land and atmosphere below you are moving very fast relative to you. You're about to drop into some extremely strong winds.

There's another way to think about this property of lenses: They only make light sources take up more of the sky; they can't make the light from any single spot brighter,[7]A popular demonstration of this: Try holding up a magnifying glass to a wall. The magnifying glass collects light from many parts of the wall and sends them to your eye, but it doesn't make the wall look brighter. because it can be shown[8]This is left as an exercise for the reader. that making the light from a given direction brighter would violate the rules of étendue.[9]My résumé says étendue is my forté. In other words, all a lens system can do is make every line of sight end on the surface of a light source, which is equivalent to making the light source surround the target.There are lots of ways to show why this is true using optics, but a simpler—if perhaps less satisfying—argument comes from thermodynamics:

Lunar Swimming - xkcd

If you put two electrons together, they try to fly apart. Electrons are negatively charged, and the force of repulsion from this charge is about 20 orders of magnitude stronger than the force of gravity pulling them together. The moon has been slowly slipping away from Earth ever since it formed billions of years ago, a time when the moon was closer and larger in the sky. xkcd / Randall Munroe. The last one. This flow of material effectively turns the entire surface of the Moon into a rocket engine—and a surprisingly efficient one, too. Using lasers to blast off surface material like this is called laser ablation, and it turns out to be a promising method for spacecraft propulsion.The Sun is about 5,000°C, so our rule says you can't focus sunlight with lenses and mirrors to get something any hotter than 5,000°C. The Moon's sunlit surface is a little over 100°C, so you can't focus moonlight to make something hotter than about 100°C. That's too cold to set most things on fire. The Moon's sunlit surface is a little over 100°C, so you can't focus moonlight to make something hotter than about 100°C. That's too cold to set most things on fire. But wait, you might say. The Moon's light isn't like the Sun's! The Sun is a blackbody—its light output is related to its high temperature

Fire From Moonlight - xkcd

It's not likely, but it is possible. Eight of the twelve are still alive. The youngest are Charlie Duke and Harrison Schmitt (both 77). The life expectancy of a US white male is 76.2 years. But, they are a hardy bunch. I've trained John Young.. With advances in lithium batteries and LED technology over the last ten years, the high-performance flashlight market has exploded. But it’s clear that flashlights aren’t gonna cut it. So let’s skip past all of that and give everyone a Nightsun. Oct 18, 2017 - Explore darthscuba92's board XKCD on Pinterest. See more ideas about Humor, Funny and Nerd jokes

The Apollo 12 backup crew even managed to play some naughty pranks on the astronauts, only to be revealed once on the moon. When executing an EVA (extra vehicular activity) on the moon, the astronauts use a checklist book strapped to their suites that resembles a small flip book In a sense, the Reissner-Nordström equations compare the outward force of the charge to the inward pull of gravity. If the outward push from the charge is large enough, it's possible the event horizon surrounding the black hole can disappear completely. That would leave behind an infinitely-dense object from which light can escape—a naked singularity.Another problem with this plan. The Earth's surface spins faster than the Moon goes around, so the end that dangled down to the Earth would break off if you tried to connect it to the ground:If you stood next to the end of the pole on the Moon, a problem would become clear right away: You have to slide up the pole, and that's not how sliding works.So suppose we spend the $2 trillion to buy one-watt green lasers for everyone. (Memo to presidential candidates: this policy would win my vote.) In addition to being more powerful, green laser light is nearer to the middle of the visible spectrum, so the eye is more sensitive to it and it seems brighter.

1074: Moon Landing - explain xkcd

  1. 'XKCD' cartoonist Randall Munroe drops science (literally) in his new book 'What If. I feel like XKCD fully commits to the one-percenter. it'll be brighter than the full moon. You'll.
  2. If the Earth stopped spinning, the normal cycle of day and night would end. The Sun wouldn't completely stop moving across the sky, but instead of rising and setting once a day, it would rise and.
  3. Home; Comic Archive; Browse by Author; Browse by Source; Comic strips remain the property of the author; requests for copying and printing should be directed to the author of the strip in question
  4. An entire universe worth of mass-energy—concentrated into the space of our (relatively small) Moon—would warp space-time so strongly that it would overpower even the repulsion of those 1052 electrons.

1456: On the Moon - explain xkcd

By comparison, the full moon lights up the Earth’s surface with about one lux of illumination—which means that not only would our lasers be too weak to see from Earth, but if you were standing on the Moon, the laser light on the landscape would be fainter than Moonlight is to us on Earth. xkcd is a Stick-Figure Comic by Randall Munroe. It is a gag-a-day comic and generally does not have a continuing plot line or continuity (though there are occasional short story arcs). Many of the jokes are based on math, physics, science, UNIX or Internet memes, as well as romance and sex. It utilizes Alt Text for each and every comic, which. Nope, you can't do this.[5]We already know this, of course, since earlier we said that it would let you violate the second law of thermodynamics.

1738: Moon Shapes - explain xkcd

  1. If we can't discuss the dwarf moon question politely, you will not discuss it on CQ. Last edited by Swift; 2015-Jan-14 at 06:55 PM . At night the stars put on a show for free (Carole King
  2. People can climb poles pretty fast. World-record pole climbers[4]Of course there's a world record for pole climbing. can climb at over a meter per second in championship competition.[5]Of course there are championship competitions. On the Moon, gravity is much weaker, so it will probably be easier to climb. On the other hand, you'll have to wear a spacesuit, so that will probably slow you down a little.
  3. On the Moon (alt-text) I believe that this nation should commit itself to achieving the goal, before this decade is out, of landing a man on Venus and returning him safely to-- [an aide frantically whispers in the president's ear for a moment] of landing a man on Venus

1300: Galilean Moons - explain xkcd

But let's ignore those problems! What if we had a magical pole that dangled from the Moon down to just above the Earth's surface, expanding and contracting so it never quite touched the ground? How long would it take to slide down from the Moon? A Conversation With Randall Munroe, the Creator of XKCD. Megan Garber. September 26, 2012 . If every person on Earth aimed a laser pointer at the Moon at the same time,. xkcd presents a Saturn V schematic using the 1,000 most used English words (xkcd.com) Randall Munroe at xkcd did it again, this time with an illustration of a Saturn V described using only the. Wrong. Here's the real answer: You can't start a fire with moonlight[1]Pretty sure this is a Bon Jovi song. no matter how big your magnifying glass is. The reason is kind of subtle. It involves a lot of arguments that sound wrong but aren't, and generally takes you down a rabbit hole of optics.Let’s assume everyone has steady enough aim to hit the Moon, but no more than that, and the light is spread evenly across the surface.

The laser pointers we’re using put out about 150 lumens of light (more than most flashlights) in a beam 5 arc-minutes wide. This lights up the surface of the Moon with about half a lux of illumination—compared to about 130,000 lux from the sun. (Even if we aimed them all perfectly, it would only manage half a dozen lux over about 10% of the Moon’s face.)The Moon orbits around the Earth at a speed of roughly one kilometer per second, making a wide circle[10]Yes, I know, orbits are conic sections which in the case of the Moon is technically not exactly a circle. It's actually a pentagon. every 29 days or so. That's how fast the top end of our hypothetical fire pole will be traveling. The bottom end of the pole makes a much smaller circle in the same amount of time, moving at an average speed of only about 35 mph relative to the center of the Moon's orbit:

2172: Lunar Cycles - explain xkcd

Swimmers wearing fins can go substantially faster than regular swimmers without them (although the fastest swimmer wearing flippers will still lose to a runner, even if the runner is also wearing flippers and jumping over hurdles).Our laser keeps pouring more and more energy into the plasma, and the plasma keeps getting hotter and hotter. The particles bounce off each other, slam into the surface of the Moon, and eventually blast away into space at a terrific speed. The changing distance separating the Moon and Earth also affects tide heights. When the Moon is closest, at perigee, the range increases, and when it is at apogee, the range shrinks.Every 7 1 ⁄ 2 lunations (the full cycles from full moon to new to full), perigee coincides with either a new or full moon causing perigean spring tides with the largest tidal range There are two possible questions here. The first is simply how long would it take for a laser to travel to the moon and back. The moon is around 384,000 km away. The speed of light is 299,792,458 m/s. The journey is round trip, so: However,.. Make sure to keep your speed low during the whole approach and descent—and, if necessary, pausing to let your hands or brakepads cool down—rather than waiting until the end to try to slow down. If you get up to escape velocity, then at the last minute remember that you need to slow down, you'll be in for an unpleasant surprise as you try to grab on to the pole. At best, you'll be flung away and plummet to your death. At worst, your hands and the surface of the pole will both be converted into exciting new forms of matter, and then you'll be flung away and plummet to your death.

258: Conspiracy Theories - explain xkcd

Like Earth sand, moon dust is effectively made of tiny glass shards, but the sharp edges have not been worn down by erosion. Randall Munroe is the author of the web comic XKCD and,. Which gives us one last way to prove that you can't start a fire with moonlight: Buzz Aldrin is still alive.

"But wait," you might say. "The Moon's light isn't like the Sun's! The Sun is a blackbody—its light output is related to its high temperature. The Moon shines with reflected sunlight, which has a "temperature" of thousands of degrees—that argument doesn't work!" The map, entitled Surface Area on Munroe's site xkcd.com, is a wonderful visualization of the relative sizes of all the major solid bodies in the solar system presented as a familiar world map The comment to which Cueball is referring is a tweet by Neil deGrasse Tyson, an American astrophysicist and science communicator. As of this comic, Tyson is the "Frederick P. Rose Director" (a special honorary title) of the Hayden Planetarium. He has appeared on many different shows, ranging from The Discovery Channel to The Big Bang Theory. \[\frac{5\text{ billion people}\times 500\frac{\mathrm{terawatts}}{\text{person}}}{\pi\times\text{Moon radius}^2}\times20\frac{\mathrm{megajoules}}{\mathrm{kilogram}}\times 3\frac{\mathrm{kilograms}}{\mathrm{liter}}\approx4 \frac{\mathrm{meters}}{\text{second}}\] September 13, 2014 Humor, Opinion, Technology, XKCD WATCH, xkcd cb (alt-txt) Old people used to write obnoxious thinkpieces about how people these days always wear watches and are slaves to the clock, but now they've switched to writing thinkpieces about how kids these days don't appreciate the benefits of an old-fashioned watch

xkcd: On the Moon

Recently, there was a timeline comic from XKCD about the history of Earth's temperature over the Holocene which got quite a bit of play, due to the fact that it had the inevitable hockey stick splice onto the end. Josh came up with a much less dogmatic and more detailed version, which we covered here Adam Savage (Mythbusters) and Randall Munroe (xkcd) are two of the best science communicators in the country. Join these two STEM icons on stage at BookCon for a remarkably smart and bizarre. If you're "surrounded" by the Sun's surface material, then you're effectively floating within the Sun, and will quickly reach the temperature of your surroundings.[10](Very hot) This is, by far, the most destructive What-If scenario to date. You might imagine an electron Moon orbiting a proton Earth, sort of like a gigantic hydrogen atom. On one level, it makes a kind of sense; after all, electrons orbit protons, and moons orbit planets. In fact, a planetary model of the. If you're surrounded by the bright surface of the Moon, what temperature will you reach? Well, rocks on the Moon's surface are nearly surrounded by the surface of the Moon, and they reach the temperature of the surface of the Moon (since they are the surface of the Moon.) So a lens system focusing moonlight can't really make something hotter than a well-placed rock sitting on the Moon's surface.

Thing Explainer: XKCD Author Explains Our ComplicatedSo it has Come to This «TwistedSifter

It’s hard to see, but we’re making progress! The beam is providing 20 lux of illumination, outshining the ambient light on the night half by a factor of two! However, it’s quite hard to see, and it certainly hasn’t affected the light half.I wonder if the "faking" comment has a second layer of meaning as in faking an orgasm? 108.162.237.4 17:12, 15 September 2019 (UTC) However, the actual lunar rock won’t evaporate that fast—for a reason that turns out to be very important.Because of the reduced gravity on the Moon, the water would be launched upward more easily, just like the swimmers. The result would be larger waves and more flying droplets. In technical terms, a pool on the Moon would be more "splashy".[6]The SI unit of splashiness is the splashypant.

If I Touched the Moon, What Would It Feel Like? - The New

xkcd: The Moon and the Great Wal

  1. Technically, the Moon won’t become a new planet, under the IAU definition of a planet. Since its new orbit crosses Earth’s, it will be considered a dwarf planet like Pluto. This Earth-crossing orbit will lead to periodic unpredictable orbital perturbation.  Eventually it will either be slingshotted into the Sun, ejected toward the outer Solar System, or slammed into one of the planets—quite possibly ours. I think we can all agree that in this case, we’d deserve it.
  2. The final sentence of title text notes that all manned missions since the Moon landings have taken place in low-earth orbit, which is barely far off of the Earth's surface. If the Earth were scaled to the size of a regulation basketball, approximately 24 cm (9¼ inches) in diameter, those manned missions would have all taken place within 1.25 cm (½ inch) of the ball's surface. At this scale the Moon would be at a distance of 7.7 m (25.3 ft). Unmanned missions, such as those named above or the Voyager and Mariner probes of the 1960s and 1970s, have travelled much further.
  3. xkcd. The blag of the webcomic Odd Temporal Milestones. Here's the report for the nine living people who have walked on the moon: ~$ python actuary.py 81m 82m 80m 81m 80m 81m 76m 78m 77m There is a 5% chance of someone dying within 0.08 years (by 2012). There is a 50% chance of someone dying within 1.1 years (by 2013)
  4. Moon's Haunted is a catchphrase based on a tweet. It has since been associated with discussions about the video game Destiny 2, which features plot points about the moon. On October 29th, 2018, Twitter [1] user @Dustinkcouch tweeted, nasa employee: oh hey u guys are back early. astronaut: moon's haunted nasa employee: what
  5. Unsubscribe from Vsauce? Sign in to add this video to a playlist. Sign in to report inappropriate content. Sign in to make your opinion count. Sign in to make your opinion count. The interactive.

High quality Xkcd gifts and merchandise. Inspired designs on t-shirts, posters, stickers, home decor, and more by independent artists and designers from around the world. All orders are custom made and most ship worldwide within 24 hours We can try to illuminate either a new moon or a full moon. The new moon is darker, making it easier to see our lasers. But the new moon is a trickier target, because it’s mostly visible during the day—washing out the effect.

xkcd 1738: Moon Shapes : xkcd - reddi

XKCD's Creator Explains What Would Happen If Earth Stopped

These comics use claims about the moon landing to criticise Conspiracy Theorist arguments. XKCD has done a few comics about the topic. The moon landing was emphatically not faked in El Goonish Shive (the government may be covering up the existence of magic and aliens, but faking a moon landing is just silly). However, the comic has made a few. Dr. Keeler's diagnosis: "Yup, black hole." But this is no an ordinary black hole; it's a black hole with a lot of electric charge.[5]The proton Earth, which would also be part of this black hole, would reduce the charge, but since an Earth-mass of protons has much less charge than a Moon-mass of electrons, it doesn't affect the result much. And for that, you need a different set of equations—rather than the standard Schwarzschild equations, you need the Reissner–Nordström ones.The distance from Earth to Moon (the farthest we have gone away from earth) is twenty four times the diameter of Earth. If the Earth was a Basketball, the farther we have gone would be three meters from it, as the basketball is about 12 cm. The Randall statement is either wrong or purposely wrong. 189.60.126.96 00:55, 28 September 2012 (UTC) It turns out it does work, for reasons we'll get to later. But first, hang on—is that rule even correct for the Sun? Sure, the thermodynamics argument seems hard to argue with,[3]Because it's correct. but to someone with a physics background who's used to thinking of energy flow, it may seem hard to swallow. Why can't you concentrate lots of sunlight onto a point to make it hot? Lenses can concentrate light down to a tiny point, right? Why can't you just concentrate more and more of the Sun's energy down onto the same point? With over 1026 watts available, you should be able to get a point as hot as you want, right?So I contacted Dr. Cindy Keeler, a string theorist with the Niels Bohr Institute. I explained Noah's scenario, and she was kind enough to offer some thoughts.

Enforced by Radar. I've occasionally seen radar enforced on speed limit signs, and I can't help but ask: How intense would radio waves have to be to stop a car from going over the speed limit, and what would happen if this were attempted? —joausc. Radio waves exert force on things. Not a lot of force. The average cell phone transmitter. Unfortunately for you, space is big, so "pretty close" is still a long way. Even if you climb at better-than-world-record speed, it will still take you several years to get to the L1 crossover point. /r/xkcd is the subreddit for the popular webcomic xkcd by Randall Munroe. Come to discuss the comics and other work by Randall with other fans If I've managed to note all that down correctly. (Note, this is nothing to do with the following plot regarding the XKCD motions, which I quite admire!) 141.101.99.229 08:09, 7 December 2013 (UTC) Hard to tell exactly which moon was which, until I plotted their cyclic orbits. -- DaveC426913 (please sign your comments with ~~~~ Right now, the Earth spins faster than the Moon, and our tides slow down the Earth's rotation while pushing the Moon away from us.[3] If we stopped rotating, the Moon would stop drifting away.

This work is licensed under a Creative Commons Attribution-NonCommercial 2.5 License. This means you're free to copy and share these comics (but not to sell them). More details. The Boy in the Barrel The very first character xkcd featured. A young boy inexplicably floating around in a barrel. Art Shift: It was only after the Boy in the Barrel's debut that the art shifted from 'semi-realistic' to 'stick-figures', making him the only non-stick-figure recurring human.; The Bus Came Back: No really. In Click & Drag he's drawn as a bald stick figure like everyone else. Some things related to the Time thread on the xkcd Fora are here. The OTT mirror. Source and instructions; The facebug copy; Other redundancy Copy of xkcd.mscha.org; BSTA. 2 words; coincidence; BFTF. The discovery; Object generator online; Chronotransponder test interface; time after Time. The viewer; The Silent Chronotransponder; ONGoing story. The giant leap for mankind is not the first step on the Moon but attaining Earth orbit. If we want to break the tyranny of the rocket equation, new paradigms of operating and new technology will be needed. If we keep to our rockets, they must become as routine, safe, and affordable as airplanes This past Monday, xkcd posted a great set of questions about the Solar System, along with a few (brief) answers: The scary (and amazing) thing? We actually know way more answers than Randall (wh

Once you have a naked singularity, physics starts breaking down in very big ways. Quantum mechanics and general relativity give absurd answers, and they're not even the same absurd answers. Some people have argued that the laws of physics don't allow that kind of situation to arise. As Dr. Keeler put it, "Nobody likes a naked singularity."Let’s swap out each Nightsun for an IMAX projector array—a 30,000-watt pair of water-cooled lamps with a combined output of over over a million lumens.

xkcd 1074: Moon Landing : xkcd - reddi

  1. istrators only had to deal with the once-in-a-blue-moon comic vandalism by Randall Munroe or Stephen Colbert, this would be a non-issue
  2. g into a system from a bunch of different angles and over a large "input" area, then the input area times the input angle[6]Note to nitpickers: In 3D systems, this is technically the solid angle, the 2D equivalent of the regular angle, but whatever. equals the output area times the output angle. If your light is concentrated to a smaller output area, then it must be "spread out" over a larger output angle.
  3. The typical red laser pointer is about 5 milliwatts, and a good one has a tight enough beam to actually hit the Moon—though it’d be spread out over a large fraction of the surface when it got there. The atmosphere would distort the beam a bit, and absorb some of it, but most of the light would make it.
  4. 8 results for xkcd 300 Xkcd - the food size cycle 300 Angular momentum 300 xkcd State word map 300 xkcd movie narrative charts 300 Xkcd questions 289 Xkcd planets 300 Xkcd gravity wells 300 Xkcd united shape
  5. So yesterday was the 40th anniversary of Neil Armstrong landed onto the moon on a fake set in a movie studio #letsbehonest #conspiracy #hoax-- TheRealThomasfy. Via xkcd.com. There are hundreds.
  6. When a chunk of rock is vaporized, it doesn’t just disappear. The surface layer of the Moon becomes a plasma, but that plasma is still blocking the path of the beam.
  7. In general, there's no way to "overlay" light beams on each other, because the whole system has to be reversible. This keeps you from squeezing more light in from a given direction, which puts a limit on how much light you can direct from a source to a target.

If we ignore general relativity for a moment—we'll come back to it—we can calculate that the energy from these electrons all pushing on each other would be enough to accelerate all of them outward at near the speed of light.[3]But not past it; we're ignoring general relativity, but not special relativity. Accelerating particles to those speeds isn't unusual; a desktop particle accelerator can accelerate electrons to a reasonable fraction of the speed of light. But the electrons in Noah's Moon would each be carrying much, much more energy than those in a normal accelerator—orders of magnitude more than the Planck energy, which is itself many orders of magnitude larger than the energies we can reach in our largest accelerators. In other words, Noah's question takes us pretty far outside normal physics, into the highly theoretical realm of things like quantum gravity and string theory.The laser itself would exert enough radiation pressure to accelerate the Moon at about one ten millionth of a gee. This acceleration wouldn’t be noticeable in the short term, but over the years, it adds up to enough to push it free from Earth orbit. Alexis flew the drone over the net and hovered there, while Serena served from the baseline. Her first serve went low. The second zipped past the drone to one side. The third serve scored a direct hit on one of the propellers. The drone spun, momentarily seemed like it might stay in the air, then flipped over and smashed into the court. Serena.

The Moon is massive, but slowly and surely the rock plasma jet begins to push it away from the Earth. (The jet would also scour clean the face of the Earth and destroy the lasers, but we’re pretending for the moment that they’re invulnerable.) The plasma also physically tears away the lunar surface, a complicated interaction that’s tricky to model. Moon Over June is a pornographic comedy comic created by the artist/writer WocGirl. The comic is about two roommates/lovers; Hatsuki, an Asian porn star, and Summer, a ginger lesbian gynecologist, and jokes about their sexual antics and lives. The comic has achieved notoriety online due to a number of criticisms, most notably the quality of the artwork and accusations of sexism towards men r/xkcd: /r/xkcd is the subreddit for the popular webcomic xkcd by Randall Munroe. Come to discuss the comics and other work by Randall with other xkcd 사이트 아래쪽에 깨알같은 글씨로 권장 사항이 적혀 있다. 한 때 많은 사이트에 달려 있었던 이 페이지는 1024*768 해상도에 최적화되어 있습니다라든지 이 페이지는 인터넷 익스플로러 5에 최적화되어 있습니다 [15] 같은 문구의 패러디이다

Laser PointerRocket Golf

I'm going to be at Comic-Con in San Diego this week! I'll be appearing on panels with some really neat people for conversations about science, comics, and writing, and talking about my new book, How To: Absurd Scientific Advice for Common Real-World Problems. Here's my panel/event schedule. If you're attending, come see me there! THURSDA 40 megajoules of energy is enough to vaporize a kilogram of rock. Assuming Moon rocks have an average density of about 3 kg/liter, the lasers would pump out enough energy to vaporize four meters of lunar bedrock per second: Two Options. Actual Increased Gravity. Gravity is a product of mass and in the case of a human and a moon, to make the gravitational attraction increase one may either increase the mass of the human or the mass of moon.. Increasing the mass of the moon would create a situation most similar to Earth conditions. One could do this by dumping mass on the outside, or by removing parts of the. Lunar Swimming. What if there was a lake on the Moon? What would it be like to swim in it? Presuming that it is sheltered in a regular atmosphere, in some giant dome or something. Kim Holder. This would be so cool. In fact, I honestly think it's cool enough that it gives us a pretty good reason to go to the Moon in the first place NASA's incredible Saturn V rocket propelled dozens of humans toward Earth's moon. The rocket's first flight, for the Apollo 4 mission, took place 50 years ago, on Nov. 9, 1967

xkcd Timeframe 1. xkcd • original <<1<< >2> >>3094>> Random with sound. Date/time: 2013-03-25 04:00 UTC Bicycles and more on the moon The Dedication of Kieryn The User Scripts of Pikrass A Map of Time by Edfel The Constellations and Time Database by Sciscitor Graphs and stuff by jjjdavidso In fact, I honestly think it's cool enough that it gives us a pretty good reason to go to the Moon in the first place. At the very least, it's better than the one Kennedy gave.But for now, at least, nearby galaxies would be safe. Since the gravitational influence of the black hole can only expand outward at the speed of light, much of the universe around us would remain blissfully unaware of our ridiculous electron experiment. Randall XKCD Munroe's next book has been announced: How To: Absurd Scientific Advice for Common Real-World Problems, a sequel of sorts to his 2014 book What If?: Serious Scientific Answers to. XKCD is a webcomic created by Randall Munroe, an ex-NASA robotics expert and programmer. The series' main subject matter revolves around math, science and Internet culture and features characters drawn as stick figures. All comics published on the site are licensed under a Creative Commons Attribution-NonCommercial 2.5 License

And it's really not impossible. A large backyard swimming pool weighs about as much as four Apollo lunar landers. A next-generation[9](or, heck, previous-generation) heavy-lift rocket, like Boeing's NASA SLS or Elon Musk's SpaceX Falcon Heavy, would be able to deliver a good-sized pool to the Moon in not too many trips. Earth-Moon Fire Pole. My son (5y) asked me today: If there were a kind of a fireman's pole from the Moon down to the Earth, how long would it take to slide all the way from the Moon to the Earth? — Ramon Schönborn, German

In which I disagree with cartoon Neil Tyson

What If? is one of my Internet must-reads, and I look forward to each new installment, and always read it with delight.-- Cory Doctorow, New York Times bestselling author Required reading across the world.-- New York Times Munroe applies reason and research to hypothetical conundrums ranging from the philosophical to the scientific (often absurd but never pseudo) that probably seemed. Asking how fast the pole is moving relative to the surface is effectively the same as asking what the "ground speed" of the Moon is. This is tricky to calculate, because the Moon's ground speed varies over time in a complicated way. Luckily for us, it doesn't vary that much—it's usually somewhere between 390 and 450 m/s, or a little over Mach 1—so figuring out the precise value isn't necessary. The new moon is darker, making it easier to see our lasers. But the new moon is a trickier target, because it's mostly visible during the day—washing out the effect. Brightness aside, an ideal time would probably be 2:00 PM EST on December 27th, 2012, when a full moon will be high in the sky above Mumbai and Islamabad To avoid splashing all the water out, you'd want to design the deck so water drains quickly back into the pool. You could just make the rim higher, but then you'd spoil one of the key joys of a pool on the Moon—exiting via Slip 'N Slide:Let’s imagine we somehow found a way to power and fire it continuously, gave one to everyone, and pointed them all at the Moon. Unfortunately, the laser energy flow would turn the atmosphere to plasma, instantly igniting the Earth’s surface and killing us all.

What if there was a lake on the Moon? What would it be like to swim in it? Presuming that it is sheltered in a regular atmosphere, in some giant dome or something. Closer to the moon landing than today. The most-relevant relevant XKCD ever. Click through for the full awesome. Tagged comic, xkcd Particle Properties. 12 July 2017 18:14 1 comment. This article is a repost promoting content originally published elsewhere There's a huge amount of potential energy in this scenario—the energy that we imagined would blast all these electrons apart. That energy warps space and time just like mass does.[4]If we let the energy blast the electrons apart at near the speed of light, we'd see that energy actually take the form of mass, as the electrons gained mass relativistically. That is, until something stringy happened. The amount of energy in our electron Moon, it turns out, is about equal to the total mass and energy of the entire visible universe.

The Internet Celebrates Our First Real Look at PlutoI made an xkcd-style chart of the first 5 acts : homestuckPlanet with multiple axis of rotation - xkcd

However, the Moon's orbit is also tilted, and this tilt rotates on an 18.9-year cycle. When the Moon's tilt is in the same direction as the Earth's, it stays 5° closer to the Equator than the Sun, and when it's in the opposite direction, it reaches more extreme latitudes. When the Moon is over a point farther from the equator, it has a lower "ground speed," so the lower end of the sine wave goes lower. Here's the plot of the Moon's "ground speed" over the next few decades:A 1-watt laser is an extremely dangerous thing. It’s not just powerful enough to blind you—it’s capable of burning skin and setting things on fire. Obviously, they’re not legal for consumer purchase in the US.The Moon shines as brightly as the midmorning sun, and by the end of the two minutes, the lunar regolith is heated to a glow.Ok, fine. There's one other cycle we can take into account to really nail down the Moon's ground speed. The Moon's orbit is tilted by about 5° relative to the Earth-Sun plane, while the Earth's axis is tilted by 23.5°. This means that the Moon's latitude changes the way the Sun's does, moving from the northern tropics to the southern tropics twice a year.This lens directs all the light from point A to point C. If the lens were to concentrate light from the Sun down to a point, it would need to direct all the light from point B to point C, too:There are a number of conspiracy theories claiming that the moon landing was a hoax. Tyson offers a pretty compelling argument against them, but Megan presents an even more convincing refutation, snarkily implying that NASA really hasn't done anything spectacular since 1969.

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