25 Lies About Space That Scientists Finally Debunked

Added: 2026-05-05

[00:00:00]The universe is strange enough without humans making up extra nonsense about it. For decades, we've been fed myths about space that somehow became common knowledge, taught in schools, repeated in documentaries, and accepted as fact by people who should know better. But science doesn't care what sounds good.

[00:00:19]The truth about space is often stranger than the fiction we invented to fill in the gaps. From the sound of explosions in the void to the actual color of the sun, everything you think you know might be wrong. I'm Mike with List 25, and these are 25 lies about space that scientists finally debunked. 25. Space isn't actually cold. It's more complicated than that. We've all heard that space is incredibly cold with temperatures near absolute zero. Here's the truth. Space is a near-perfect vacuum, which means there's almost nothing there to have a temperature at all. Temperature requires matter. Space has almost none. What this means practically is that you wouldn't freeze instantly in space, as movies show.

[00:01:06]Without air molecules to carry heat away from your body, you'd actually have trouble cooling off. Astronauts in direct sunlight can experience temperatures of over 250° F. In shadow, you'd eventually freeze, but through radiation, not convection. It would take hours, not seconds. The real danger in space isn't the cold. It's the pressure differential. 24. There's no such thing as a dark side of the moon. Pink Floyd lied to you. Well, sort of. There's no permanently dark side of the moon. Every part of the lunar surface receives sunlight at some point during the moon's 29 1/2 day orbit around Earth. What people mean is the far side, a hemisphere that perfectly faces away from Earth due to tidal locking. But far doesn't mean dark. The far side experiences two weeks of continuous daylight followed by two weeks of night.

[00:02:00]Just like the near side, ironically, during a new moon, when the near side appears dark from Earth, the far side is fully illuminated. The dark side is just the side we can't see, not the side that never sees light. 23. The Great Wall of China isn't visible from space. This myth has been repeated so often it ended up in textbooks. The claim was that the Great Wall is the only human-made structure visible from space with the naked eye. NASA has definitively debunked this. The Great Wall is long, but it's only about 15 to 30 ft wide.

[00:02:36]From low Earth orbit, where the ISS flies, you'd need visual acuity about eight times better than normal to distinguish it. Astronauts report that cities, airports, and highways are far more visible than the wall. The myth probably started because people confuse impressive size on the ground with visibility from above. A long, thin structure is practically invisible compared to the sprawling footprint of a modern city. 22. The sun is actually white, not yellow. Look at every children's drawing, every emoji, every flag featuring the sun. It's yellow. The actual sun viewed from space is white.

[00:03:15]Pure white containing all visible wavelengths of light in roughly equal amounts. So why does it look yellow from Earth? Our atmosphere scatters blue light through a process called RA scattering. Remove blue from white and you get yellow. At sunrise and sunset, when sunlight travels through more atmosphere, you scatter even more blue and eventually green, leaving red and orange. Astronauts consistently describe looking at the sun from space through proper filters, obviously, as blindingly pure white. Every yellow sun you've ever drawn was an Earth atmosphere lie. 21.

[00:03:51]Mercury isn't the hottest planet despite being closest to the sun.

[00:03:56]Basic logic suggests the planet nearest to the sun should be the hottest, but Venus, which orbits about 30 million miles farther than Mercury, is significantly hotter. Venus averages 867° F compared to Mercury's maximum of 800. The reason is atmosphere. Mercury has virtually none to trap heat. So, it loses energy to space efficiently.

[00:04:20]Venus's is 90 times denser than Earth's, made almost entirely of carbon dioxide, the most effective natural greenhouse gas. Heat from the sun enters Venus but can't escape. It's the universe's most extreme greenhouse effect. Distance from a star matters less than whether you can hold on to the heat you receive. 20.

[00:04:40]Astronauts don't actually float in space. They're falling. Zero gravity is a misnomer. The ISS orbits Earth at an altitude where gravity is still about 90% as strong as on the surface.

[00:04:54]Astronauts aren't escaping gravity.

[00:04:56]They're perpetually falling around Earth. The ISS is essentially a projectile that moves sideways fast enough that as it falls toward Earth, Earth's surface curves away at the same rate. The sensation of weightlessness comes from being in continuous freefall, not from the absence of gravity. If you stopped the ISS and dropped it straight down, it would crash into Earth like anything else. Zero G is really zero G force. No external force pushing you against any surface because everything around you is falling at the same rate.

[00:05:29]19. There's no scientific consensus that there are only eight planets. Heard about Pluto? Messed up, right? When Pluto was reclassified in 2006, it seemed like a settled question. But the definition of planet adopted by the International Astronomical Union is actually controversial among astronomers themselves. The main sticking point is the criterion that the planet must have cleared its orbital neighborhood. By this definition, even Earth wouldn't qualify if placed on the asteroid belt.

[00:06:03]Additionally, the IAU vote was attended by only 424 of over 10,000 members, and many planetary scientists consider the definition arbitrary. Alan Stern, the principal investigator of the New Horizon's mission to Pluto, refuses to accept the reclassification. The debate continues in scientific circles, even if textbooks present eight planets as established fact. 18. Black holes don't actually suck things in like vacuum cleaners. Hollywood depicts black holes as cosmic drain plugs, voraciously sucking in everything nearby. In reality, a black hole's gravitational pull at a given distance is exactly the same as any other object with the same mass. If the sun suddenly collapsed into a black hole, it won't not massive enough. Earth would continue orbiting normally. We wouldn't be sucked in. The gravitational pole at Earth's distance would be identical because the mass hasn't changed, only its density. Black holes only become dangerous when you get very close. The event horizon, the point of no return, is typically very small.

[00:07:08]For a sun mass black hole, you'd need to approach within about 1.8 mi to be trapped. Space is mostly empty and black holes are actually terrible at capturing things randomly passing by. 17. The Big Bang wasn't an explosion in space. It was an explosion of space. The name Big Bang creates a mental image of a firecracker exploding in pre-existing empty space. That's completely wrong.

[00:07:36]Before the Big Bang, there was no space.

[00:07:39]No vacuum, no emptiness, nothing. The Big Bang was the creation of space itself, expanding from a point of infinite density. It didn't happen at a location in the universe. It happened everywhere simultaneously because everywhere came into existence with the event. This means there is no center of the universe. No edge we're expanding toward. Every point in space is where the Big Bang happened. The expansion isn't galaxies moving through space.

[00:08:07]It's space itself stretching and carrying galaxies along.

[00:08:12]16. You can't hear anything in space, not even explosions. This one the movies really should have figured out by now.

[00:08:21]Sound requires a medium to travel through. Air, water, solid material.

[00:08:26]Space has essentially no matter to vibrate, so sound cannot propagate.

[00:08:31]Those dramatic explosion sounds in Star Wars, they'd be completely silent in reality. The Millennium Falcon screaming through space, noiseless.

[00:08:45]Even the loudest nuclear explosion in the vacuum of space would produce no sound waves whatsoever. Interestingly, there are regions of space with enough gas that low frequency vibrations can technically propagate. NASA released sonification of sound waves from a black hole in 2022, but these frequencies are far too low for human hearing and would still seem silent to anyone floating nearby. 15. We didn't evolve from apes.

[00:09:13]We are still apes. And that's relevant to space. Wait, what does evolution have to do with space?

[00:09:21]Everything. One of the biggest misconceptions holding back human space exploration is that we're somehow meant for Earth specifically, divinely placed or evolutionary optimized for this planet alone. Truth is, humans are just apes who develop big brains. We are members of the great ape family, not something beyond it. Our bodies evolve for African savas, not even the entire Earth. We're terrible at handling cold, altitude, and darkness. and space has all three in excess. Understanding that we're biological creatures with specific evolutionary limitations, not cosmically destined occupants of Earth, is crucial for designing spacecraft and space habitats that accommodate what we actually are. 14. There is no scientific basis for your astrological sign affecting anything. Astronomy and astrology were once intertwined, but split centuries ago. Modern astronomy has found zero evidence that the positions of stars and planets at your birth affect your personality, relationships, or destiny. The constellations of the zodiac are arbitrary groupings of stars at vastly different distances from Earth, connected only by humans drawing imaginary lines. And due to Earth's axial procession, the sun isn't even the constellation astrology says it's in during your birth month. The zodiac hasn't been updated in about 2,000 years. The Barnum effect, the tendency to accept vague general statements as personally meaningful, explains why horoscopes feel accurate. It's psychology, not astronomy. 13. Meteors don't heat up from friction. It's compression. The classic explanation for why meteors glow is that they experience friction with the atmosphere, like rubbing your hands together. That's not the primary mechanism. When a meteor enters the atmosphere at up to 45 m/s, it compresses the air in front of it so rapidly that the air itself heats to incandescent. Think of how a bicycle pump gets warm. That's compression heating. At meteor speeds, this effect generates temperatures exceeding 3,000° F. The meteor surface vaporizes not from rubbing against air molecules, but from being bathed in superheated compressed gas. The distinction matters for understanding re-entry vehicle design and why certain materials work better than others for heat shields. 12. The galactic bulge formed from the disc. The dense cluster of stars at the center of the Milky Way. The bright bulge you can see in photographs of the galaxy was long assumed to be exactly what it looks like. Old stars that gradually drifted inward from the outer disc over billions of years and accumulated in the middle.

[00:12:01]Chemical analysis told another story.

[00:12:04]The bulge stars have a distinct chemical composition compared to stars in the outer disc. A signature that doesn't match the migration theory and instead points to a population that formed separately, rapidly, and under very different conditions during the earliest, and most chaotic period of the galaxy's formation. 11. The asteroid belt isn't a dense field of rocks. Every movie showing spacecraft dodging asteroids through a crowded belt is lying to you. The asteroid belt contains millions of asteroids, but it's spread across a volume so vast that the average distance between them is about 600,000 m. NASA sent multiple spacecraft through the asteroid belt without any special navigation. They didn't see any asteroids except the ones they specifically targeted. Sir, the possibility of successfully navigating an asteroid field is approximately 3,720 to1.

[00:12:56]>> Never tell me the odds.

[00:12:58]>> Sorry, 3PO. If you were standing on an asteroid in the belt, the next closest one would likely be invisible to the naked eye, too far away and too dim.

[00:13:08]Space is mostly empty, even in the crowded parts. 10. Satellites don't stay up because they're beyond gravity. Many people imagine satellites floating in space because they've escaped Earth's gravity. In reality, low Earth orbit satellites experience about 90% of the gravity you feel on the surface. The ISS is only about 250 mi up. Barely a 4-hour drive if if you could drive straight up.

[00:13:35]That is satellites stay in orbit by moving sideways fast enough that they continuously miss the Earth as they fall toward it. Like I said, it's controlled falling, not floating. If a satellite slowed down, it would crash. If it sped up too much, it would fly away into space. Geostationary satellites 22,000 mi up still experience gravity, just weaker. They orbit once every 24 hours, matching Earth's rotation, which is why satellite TV dishes can point at a fixed location in the sky. Nine, there's no evidence for the cosmological multiverse.

[00:14:10]Popular science articles and documentaries love to present the multiverse as established physics. It's not. The multiverse hypothesis that our universe is one of infinitely many is unfalsifiable speculation that makes no testable predictions. Some interpretations of quantum mechanics suggest a many worlds interpretation where every possible outcome occurs in branching universes. But this is a philosophical interpretation, not a scientific finding. No experiment can detect or communicate with other universes, making the hypothesis scientifically unstable. The multiverse may be real. It may not be. Currently, it's a mathematical possibility, not a scientific fact. Anyone presenting it as proven has crossed from physics into metaphysics.

[00:14:58]Eight. Stars don't actually twinkle.

[00:15:01]That's just atmospheric distortion. The twinkle twinkle little star phenomenon is 100% atmospheric. Stars emit constant steady light. When that light passes through Earth's turbulent atmosphere, it gets bent and scattered unpredictably causing the apparent twinkling. Planets twinkle much less because they're close enough to appear as tiny discs rather than point sources. The light from different parts of the disc averages out the atmospheric effects. Stars are so distant that they appear as points, maximizing the twinkle. Astronauts report that stars in space don't twinkle at all. They're rock steady points of light. The romantic twinkling we associate with stargazing is essentially just air pollution. Seven. We know far less about the ocean floor than about the moon. This sounds backward since the moon is 238,900 m away, but it's true. We've mapped approximately 5% of the ocean floor in high resolution. The lunar surface, visible from Earth and visited by spacecraft, is far better documented.

[00:16:09]The ocean presents challenges that space doesn't. crushing pressure, complete darkness, corrosive saltwater, and the inability to use radar or optical mapping through water. Soundbased mapping is slow and expensive. This isn't to diminish space exploration, but to highlight that unknown frontier, doesn't require leaving Earth. The Mariana Trench, just 7 mi down, is in many ways more alien and inaccessible than the moon's surface. Six. Einstein's biggest blunder might have been correct.

[00:16:44]After all, Einstein added a cosmological constant to his equations to allow for a static universe, then called it his greatest blunder when the universe was discovered to be expanding. He removed the constant and regretted ever proposing it. Then we discovered dark energy. The universe isn't just expanding, it's accelerating.

[00:17:05]Something, we call it dark energy because we don't know what it is, is pushing space apart faster and faster.

[00:17:11]And guess what describes that perfectly?

[00:17:14]A cosmological constant. Einstein may have been right for the wrong reasons.

[00:17:18]The cosmological constant he dismissed as a mistake may be the most important term in his equations for understanding the fate of the universe. Five, you can't see the Milky Way from most populated areas.

[00:17:32]Ask someone if they've seen the Milky Way, and they might say yes. But like me, if they live in or near a city, they almost certainly haven't. Light pollution has made the galaxy invisible to over 80% of the world's population.

[00:17:46]What most people see looking up at night is a washed out dome with maybe a few dozen visible stars. The Milky Way, that luminous band stretching across the sky containing 200 to 400 billion stars, requires genuinely dark skies that barely exist in developed countries anymore. Studies suggest most kids today will never experience a truly dark sky in their lifetimes. The night sky our ancestors navigated by, wrote poetry about, and built religions around is effectively gone from daily human experience, or I guess technically nightly human experience. Four, Voyager 1 hasn't really left the solar system.

[00:18:28]Headlines frequently announce Voyager has left the solar system or entered interstellar space. This is technically true by some definitions, but deeply misleading by others. Voyager 1 crossed the helopause in 2012, the boundary where the sun's solar wind meets interstellar medium. By that definition, it's in interstellar space, but it won't exit the Orort cloud, the vast shield of icy bodies gravitationally bound by the sun for another 30,000 years. The or cloud extends roughly halfway to the nearest star. In that sense, Voyager is still very much inside the solar system and will be for longer than human civilization has existed. Three, humans didn't evolve to handle the scale of space. This isn't a lie we were told so much as a cognitive limitation we ignore. Human brains evolved to handle savannah scales, miles, not light years.

[00:19:24]We genuinely cannot comprehend cosmic distances. When someone says Andromeda is 2 and a half million light-years away, you nod, but you don't actually process that distance. The number is meaningless to human intuition. Even within the solar system, we struggle.

[00:19:40]Light takes 8 minutes from the sun to Earth, but that 8 minutes represents 93 million miles your brain cannot visualize. This isn't about intelligence. It's about evolutionary mismatch. Our comprehension system maxed out at how far to the next watering hole. We can do the math on cosmic scales, but we can never truly understand them. Two, most of the universe is invisible, and we have no idea what it is. Only about 5% of the universe is ordinary matter, the stuff that makes up stars, planets, and us.

[00:20:14]The rest is dark matter, 27%, and dark energy, 68%.

[00:20:19]Neither of which we've ever directly detected or understood. We know dark matter exists because we can see its gravitational effects on galaxies. We know dark energy exists because the universe is accelerating apart. But we don't know what either actually is. Dark is a physicist's way of saying we're in the dark. This isn't a minor gap in knowledge. 95% of reality is made of stuff we can't explain. Every physics textbook is describing only 12th of what exists. One. We are not the center of anything. For millennia, humans assumed Earth was the center of the universe.

[00:20:58]Capernacus moved the center to the sun.

[00:21:01]Galileo confirmed it. Then we realized the sun was an ordinary star on the outskirts of an ordinary galaxy, one of 200 billion in the observable universe.

[00:21:10]There is no center. The universe is expanding in all directions from all points simultaneously. Wherever you are appears to be the center because everything is moving away from you. But that's true for every point in space.

[00:21:24]Psychologically, we still act like we're cosmically significant. We search for meaning as if the universe was made for us. But science has found no evidence that Earth, humanity, or our little patch of spaceime is special in any way.

[00:21:38]We're not the center of the solar system, not the center of the galaxy, not the center of the universe. We're a thin film of biological processes on a rock orbiting an ordinary star in an ordinary galaxy universe that doesn't notice we exist. And somehow knowing that makes the fact that we're here at all even more remarkable. That's the 25 lies about space that scientists have debunked.

[00:22:03]The universe is weirder, lonelier, and more mysterious than the comfortable falsehoods we invented to make it feel manageable. But the truth, even when humbling, is always more fascinating than fiction. And if the real universe has you hooked, check out our next video, 25 puzzling mysteries from outer space that'll leave you baffled. As always, don't forget to like, share, comment, subscribe, and hit that notification bell for more lists that separate fact from fiction. As always, I'm Mike with List25 and I will see you in the next