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# Xkcd moon

## Video: xkcd: Apollo Speeche

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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.

### 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

• [ mukeshbalani.com ] You heard it here firstif you haven't already heard it elsewhere Moon Shape
• Our moon is on the move. Each year, it drifts an estimated 1.5 inches further away from Earth. And in the process, Earth's rotation is actually slowing down. What if one night, the moon simply.
• Floating would feel about the same on the Moon as on Earth, since how high in the water you float depends only on your body's density compared to the water's, not the strength of gravity.
• After another few weeks of gliding along the pole, you'll start to feel gravity take over, speeding you up faster than you can go by pushing yourself. When this happens, be careful—soon, you'll need to start worrying about going too fast.
• But if we make the wild guess that the particles in the plasma exit at an average speed of 500 kilometers per second, then it will take a few months for the Moon to be pushed out of range of our laser. It will keep most of its mass, but escape Earth’s gravity and enter a lopsided orbit around the sun.
• g missiles in mid-flight.
• 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. At that point, the Moon will be visible to approximately five billion people—most of Asia, Europe, and Africa—about as many as can ever see it at one time.

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.

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.

• Space has been a little disappointing for the last few decades. Since the moon, everything has turned out kind of barren. Every SETI-related result of the past 30 years has been disheartening -- there was once water on Mars doesn't really do it for me. There are two big exceptions. One is Jupiter and Saturn'
• Rated for making xkcd worse: 10/10 Your rating: [please pick an option] [1] ur doin it wrong: it's better [2] it's exactly the same [3] a fair attempt [4] travesty [5] comprehensive destructio
• First, here's a general rule of thumb: You can't use lenses and mirrors to make something hotter than the surface of the light source itself. In other words, you can't use sunlight to make something hotter than the surface of the Sun.

"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.

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

• Basketball is a peaceful planet, we have no weapons -- Hardware Wars. Mountain Hikes (talk) 03:40, 11 February 2016 (UTC)
• Tim Qian has created a Javascript library called chart.xkcd for making charts that look hand-drawn in the style of XKCD.. It's easy to get started with chart.xkcd. All that's required is the script included in your page along with a single <svg> node to render the chart
• A harvest moon is the traditional name for the full moon closest to the autumnal equinox, but there is nothing astronomically significant about it. A supermoon is a full or new moon when the Moon is closest to the Earth, resulting in a slightly larger-than-usual apparent size. A full supermoon is roughly 14% larger in diameter than when the.

### 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

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

• The beam is several degrees wide, we’ll want some focusing lenses to get it down to the half-degree needed to hit the Moon.
• But let’s pick a quarter moon instead, so we can see the effect on the dark side. We’ll avoid the December 21st quarter moon to avoid encouraging any Mayan nonsense, and pick the one on January 4th, 2013, half an hour after midnight (GMT). It’ll be day in East Asia but night in Africa and Europe.
• Comic 553: (Pirate) Baying at the Moon. Oh hello there! Have you heard of this new comic 'XKCD?' I have not read through the archives but it appears to be kind of not very good! Like this one from just today, for instance! It is about how the Pirate Bay people are being tried, and how the Swedish legal system doesn't have a jury, and because.
• istration by the historian James Mann in 1999, the speech was.
• r/xkcd: /r/xkcd is the subreddit for the popular webcomic xkcd by Randall Munroe. Press question mark to learn the rest of the keyboard shortcuts. log in sign up. User account menu. 650. xkcd 1074: Moon Landing. XKCD. Close. 650. Posted by. Had I had the ability, I'd've built a ramp to get into space. 1 year ago. Archived. xkcd 1074: Moon.
• Below is a transcript from the interview with Stanley Kubrick, in which the 2001 Space Odyssey Director admits on camera that, the moon landings ALL were faked, and that I was the person who.
• It's January 2015 and somewhere in Los Angeles, the Tyrell Corporation are developing the Replicants that die in 2019. Sometime in the next four years someone is going to be off the shoulder of Orion. I have no idea what the hell this comic is alluding. I used Google News BEFORE it was clickbait (talk) 19:18, 21 January 2015 (UTC)

### XKCD's Creator Explains What Would Happen If Earth Stopped

• 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. No. First, the rock has a reflectivity
• g home you left behind
• XKCD's Randall Munroe is publishing a book of science explainers! What If?: The Moon hasn't stopped rotating around the Earth. However, without the Earth's rotation feeding it tidal energy,.

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.

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

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

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.

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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