Andromeda Would Take NASA s FASTEST Probe 4 TRILLION Years To ReachHere s Why

Why you'll never visit Andromeda. And that's okay. I need to tell you something. And I need you to stay with me here. Because this is important. Not because it's political. Not because someone got indicted. But because what I'm about to walk you through tonight is going to fundamentally change the way you see the sky above your head. The ground beneath your feet. And your place in everything in between. Tonight we're going somewhere different. We're leaving Washington behind. We're leaving the courtrooms behind. And we're going to talk about something so vast. So incomprehensibly enormous. That by the time I'm done. You're going to walk outside. Look up. And feel something you haven't felt in a long time. We're going to talk about the Andromeda Galaxy. And more specifically. We're going to talk about why you will never ever visit it. Not you. Not your grandchildren. Not the most advanced civilization that will ever exist on this planet. Nobody's going. And here's the thing. That's not a tragedy. That's not a failure. That might just be the most beautiful and humbling fact in all of science. Stay with me here. A lot of people. Good, intelligent, curious people. They hear about space travel and they think, well, give it time. We went from the Wright Brothers to the moon in 66 years. Surely if we keep going, we'll reach other galaxies eventually. It's just a matter of building a faster rocket, right? Better engines. More fuel. Maybe some kind of warp drive like in the movies. And I get that thinking. I really do. Americans especially. We're wired to believe that every frontier can be conquered. That every impossible thing is just a problem waiting for the right engineer. And in a lot of cases that's true. But not this one. This one is different. And I don't say that lightly. But when you see the actual numbers. When you understand what we're really talking about. You'll know why I say it with such certainty. Let's start here. Andromeda is the closest major galaxy to our Milky Way. Not the closest object in space. We've got nearby stars. We've got dwarf galaxies. But Andromeda is the nearest full-sized galaxy that looks anything like ours. It's our neighbor. And it's 2.5 million light years away. Let me say that again so it lands properly. 2.5 million light years. Now a lot of people hear light year and they think it's a measurement of time. It's not. A light year is a measurement of distance. It's how far light travels in one full year. And light, let me remind you, is the fastest thing in the known universe. Nothing moves faster. Light travels at 300,000 kilometers per second. Every single second. So a light year is how far that blinding incomprehensible speed carries you over the course of an entire year. That works out to about 9.5 trillion kilometers. Trillion with a T. Now take that number and multiply it by 2.5 million. You get approximately 24 quintillion kilometers. That's a 24 followed by 18 zeros. I'm not even going to try to write that out because your eyes would glaze over. But here's what you need to understand. That number is so large that it has effectively no meaning in human terms. It's like trying to count every grain of sand in every desert on Earth and then being told that's still not even close. If you're finding this valuable, and I think you will, make sure you subscribe to this channel right now and turn on notifications because I'm going to be doing more content like this. Topics that stretch your mind and change the way you see the world. Hit that subscribe button, let's keep going. So how long would it actually take to get to Andromeda? Let's use the fastest thing humanity has ever built as our benchmark. That would be NASA's Parker Solar Probe. This thing is screaming through space at approximately 700,000 kilometers per hour. To put that in perspective, it could circle the entire Earth in under three minutes. That is staggeringly fast by any human standard. But if you pointed the Parker Solar Probe at Andromeda and let it fly, do you know how long it would take to arrive? Four trillion years. Let that sink in. The entire universe is only about 13.8 billion years old. So the travel time would be roughly 300 times longer than everything that has ever existed has existed. By the time you were halfway there, the stars you launched from would be dead. Our sun would have burned out billions of years earlier. Earth would be dust. The Milky Way itself might not even be recognizable. And you'd still be nowhere close. Think about what that means. We're not talking about a hard trip. We're not talking about a long trip. We're talking about a trip that outlasts the lifespan of stars. A trip that outlasts the lifespan of galaxies. A trip that makes the entire history of the cosmos look like a commercial break. Stay with me here because this is where it gets really interesting. Let's imagine we could go faster. A lot faster. Let's say some genius engineer figures out how to build a spacecraft that can travel at 10% of the speed of light. That's 30,000 kilometers every single second. At that velocity, you could reach Mars in minutes. You could cross the solar system before your coffee gets cold. At 10% of light speed, the trip to Andromeda would take 25 million years. 25 million years. Let me give you some context for that number. 25 million years ago, our ancestors weren't human beings. They were apes. Early primates swinging through trees with no concept of language, fire, or civilization. If those apes had somehow built a rocket and launched it toward Andromeda at 10% of light speed, that rocket would still not have arrived. Humanity didn't exist 25 million years ago. And the rocket would still be flying. Now here's where people usually say, Okay, Marcus, what if we go even faster? What about light speed? Fine, let's break physics. Let's pretend we can actually reach the speed of light. At light speed, you'd make it to Andromeda in 2.5 million years. That's better, right? Except for two small problems. First, 2.5 million years is still an unfathomable amount of time. The pyramids were built about 5,000 years ago. Multiply that by 500 and you start approaching the travel time. You'd need to sustain a civilization on a spacecraft for longer than civilization has existed on Earth by a factor of hundreds. Second, and this is the big one, you can't reach light speed. It's not a technology problem. It's not an engineering problem. It's a physics problem. According to Einstein's theory of special relativity, as any object with mass accelerates toward the speed of light, its energy requirement increases. Not linearly, exponentially. The closer you get to light speed, the more energy you need. Until at light speed itself, you'd need infinite energy. And infinite energy doesn't exist. Think of it like trying to make your car go faster by adding more fuel. You add a gallon, you go a little faster. You add 10 gallons, a little more. But as you approach light speed, it's like you need to add the entire ocean, then all the oceans, then all the water in the solar system, and you're still not there. The math doesn't just get hard. It becomes physically impossible. So light speed is off the table. Not someday. Not with better technology. The universe itself has drawn a line and said, this far and no further. If you're still with me, hit that like button right now, because this story is about to take a turn that I think is going to blow your mind. And drop a comment telling me where you're watching from. I want to know how far this video is reaching. Now, I know what some of you are thinking. What about the science fiction stuff? What about warp drives, wormholes, hyperspace, all those concepts from Star Trek and Star Wars that seem like they might eventually become real? Let's talk about that honestly. A warp drive, the kind they use in Star Trek, doesn't actually move a ship faster than light. What it does, at least in theory, is bend space itself. It compresses the space in front of the ship and expands the space behind it so the ship isn't moving through space faster than light. The space is moving around the ship. It's clever. It's elegant. And it might even be theoretically possible based on some very speculative physics papers. The problem? To power a warp drive, you would need a quantity of energy that is almost as absurd as the distances we're talking about. We're talking about more energy than all the stars in the Milky Way produce combined. Not a few stars. All of them. Every one of the estimated 200 to 400 billion stars in our galaxy. All of their energy output. And it still might not be enough. Right now, a warp drive is not science. It's math doodles on a whiteboard with a lot of question marks. Beautiful math. Interesting math. But math that has no connection to anything we can actually build. And wormholes? Same story, different chapter. A wormhole, theoretically, would be a kind of shortcut through space-time. You go in one end, you come out another, and you've skipped over millions of light years in between. Sounds perfect. Except if wormholes exist, and that's a very big if, they would almost certainly be unstable. They'd collapse the moment you tried to pass through them. And anything inside at the moment of collapse would be subjected to gravitational forces so extreme that physicists have a technical term for what would happen to you. Spaghettification. I'm not making that up. That's the actual scientific term. Your body would be stretched and pulled apart like a piece of spaghetti by the tidal forces of the collapsing wormhole. It's not a door. It's a garbage disposal. So for now, and for the foreseeable future, and probably for all of human existence, we are stuck moving through space the old-fashioned way. Slowly, painfully, impossibly slowly compared to the distances involved. And even if you could somehow move fast, space itself is trying to kill you every step of the way. Stay with me here because this is something most people never think about. Space is not empty. I mean, it's mostly empty, yes. But mostly is doing a lot of heavy lifting in that sentence. Even in the vast emptiness between galaxies, there are particles. Dust. Tiny grains of matter drifting through the void. And at high speeds, those tiny particles become lethal. At just 10% of the speed of light, a single grain of sand hitting your spacecraft would impact with the energy of a small bomb. It would blow a hole clean through your hull. And you can't dodge what you can't see. At those speeds, you'd be hitting billions of particles over millions of years. Your ship wouldn't make it. No ship would. Then there's radiation. Cosmic radiation bombards everything in space. On Earth, our atmosphere and magnetic field protect us. Out there, you've got nothing. A million-year journey through unshielded cosmic radiation would be a death sentence many times over. And let's talk about the human element. Even if the ship survived, even if the radiation could be shielded, you'd need to sustain a human population for millions of years. Food, water, oxygen, sanity. You'd need a floating city passing knowledge and culture from one generation to the next for thousands and thousands of generations. Picture this. You launch the ship. A hundred years later, everyone who knew Earth has died. A thousand years later, the language has drifted so much that they can't read the original mission documents. Ten thousand years later, they've forgotten why they're even going. A million years later, they've evolved. Literally evolved. They are no longer the same species that launched the mission. It's not a journey. It's a sentence. A prison sentence measured in geological time. Let me try to put these distances in terms that might actually register with your brain. Because I've thrown a lot of numbers at you, and numbers at this scale become white noise. Imagine you're standing at the front door of your house and someone tells you that Andromeda is on the other side of town. Okay, that's a drive. You can picture that. But now imagine that your front door represents Earth and the other side of town represents the moon. That's roughly a quarter of a million miles. We've been there. We've done that. Now the sun, in this analogy, the sun would be about 390 times farther than the moon. So if the moon is across town, the sun is in another state. Getting there is harder, but maybe conceivable. Now here's where your brain breaks. In this same analogy, Andromeda wouldn't be in another state. It wouldn't be in another country. It wouldn't even be on the same planet. Andromeda, in this analogy, would be roughly 60 billion miles away from your front door. That distance doesn't exist on Earth. You'd need to leave Earth, pass the sun, pass all the planets, leave the solar system entirely, and keep going for a distance that dwarfs everything you've already passed. And you'd still only be at the starting line. That's the scale we're dealing with. And here's another way to think about it that I find even more unsettling. Let's talk about generation ships. This is a concept that serious scientists have actually discussed. The idea is simple. You can't get a single person to Andromeda. No one lives long enough. So instead, you build a massive ship, basically a self-sustaining city in space, and you fill it with people. They live, they have children, those children have children, and so on and so on for generation after generation after generation. Eventually, maybe their distant descendants arrive at the destination. It's a romantic idea, a multi-generational arc sailing through the cosmos. Hollywood loves it. But let's do the math. Even at 10% of light speed, remember, the trip takes 25 million years. A human generation is roughly 25 to 30 years. So you'd need approximately 1 million generations of humans to complete the journey. 1 million generations. For context, all of recorded human history, everything from the first cave paintings to this video you're watching right now, that's roughly 500 generations. So a generation ship to Andromeda would need to sustain human life for 2,000 times longer than all of recorded history. Think about how much humanity has changed in just 500 generations. We went from hunter-gatherers to iPhones, from stone tools to quantum computers, from campfires to nuclear reactors. Now imagine 2,000 times that amount of change happening inside a metal tube hurtling through empty space. The people who arrived at Andromeda, if anyone arrived at all, would bear no resemblance to the people who launched. They wouldn't speak the same language. They wouldn't share the same culture. They might not even be the same species. Natural selection and genetic drift would have done their work over a million generations. The humans who step off that ship might look at actual photographs of us and not recognize what they're seeing. It's a ship of theseus problem on a biological scale. If every plank has been replaced, is it the same ship? If every gene has drifted, is it the same species? If every memory of Earth has been lost to the fog of a million generations, does the mission even mean what it meant when it started? I find that thought deeply fascinating and a little haunting. Here's where it gets genuinely interesting, though. And here's what most people are missing about this whole conversation. You don't have to go to Andromeda. It's coming to you. I'm serious. The Andromeda galaxy is moving toward the Milky Way right now, at this very moment, at approximately 400,000 kilometers per hour. Our two galaxies are on a collision course. And in about 4 to 5 billion years, they're going to collide. Not metaphorically. Literally collide. Two galaxies containing hundreds of billions of stars each are going to merge into a single enormous galaxy. Astronomers have already named it. They're calling it Milkdromeda, which, let's be honest, is a terrible name. But the event itself will be spectacular. When it happens, the night sky will transform. Right now, when you look up on a clear night, you see a few thousand stars with the naked eye. After the merger, the sky will be ablaze with millions of new stars. Imagine looking up and seeing not darkness punctuated by light, but light punctuated by darkness. Entire rivers of stars streaming across the sky. Now, before you get too excited, I should mention the small detail that by the time this happens, the sun will be in its death throes. In about 5 billion years, our sun will exhaust its hydrogen fuel and expand into a red giant, likely engulfing Mercury, Venus, and possibly Earth. The oceans will boil. The atmosphere will burn away. Whatever's left of our planet will be a scorched, lifeless rock. So, Andromeda will come to us, but we won't be here to see it. Now, I want to clear up a common misconception about this collision, because I think a lot of people picture it wrong. When I say two galaxies will collide, your brain probably imagines a car crash. A violent, destructive smashing together of stuff. Stars slamming into each other. Explosions everywhere. That's not what happens. Here's what you need to understand. Galaxies are mostly empty space. The distances between individual stars within a galaxy are so vast that when two galaxies merge, the actual chance of any two stars colliding is almost zero. It's like throwing two swarms of gnats at each other. The gnats are so small relative to the space between them that they just pass right through. What does happen is gravitational chaos. The gravitational pull of billions of stars warps the structure of both galaxies. The beautiful spiral arms get pulled apart. Stars get flung into new orbits. Some stars get ejected entirely, thrown out into intergalactic space to wander alone forever. New stars are born in massive waves as clouds of gas are compressed by the gravitational turbulence. It would take hundreds of millions of years for the merger to complete. This isn't an event. It's an era. A slow, majestic, terrifying dance of gravity playing out over time scales that make human civilization look like the blink of an eye. And the name astronomers have given the merged result, Milkdromeda, honestly doesn't do it justice. We're talking about the birth of an entirely new galaxy. A galaxy that will contain the remnants of everything we've ever known, every star we've ever seen, every planet we've ever studied, all reshuffled, rearranged, and reborn into something entirely new. It's destruction and creation at the same time on a scale that challenges the limits of human imagination. And that brings me to what I think is the most profound part of this entire story. The part that honestly is why I wanted to make this video in the first place. When you look at Andromeda in the night sky, and you can do this, by the way, with your naked eye on a clear night, it appears as a tiny, faint smudge of light. You're not seeing it as it is right now. You're seeing it as it was 2.5 million years ago. Let me say that again because I need it to really land. The light you see when you look at Andromeda tonight left that galaxy 2.5 million years ago. It has been traveling through the emptiness of space at the fastest speed the universe allows for two and a half million years just to reach your eyes at this very moment. You're looking into the past. Every time you look at the night sky, you're looking into the past. The stars you see may not even exist anymore. Their light is a message from another time, arriving after an unimaginable journey through nothing. Now flip that around. If there's some intelligent being in Andromeda right now, some alien astronomer with a powerful enough telescope pointed at our little corner of the Milky Way, they wouldn't see you. They wouldn't see cities or cars or any trace of human civilization. They'd see Earth as it was 2.5 million years ago. They'd see early human ancestors, maybe Homo habilis using crude stone tools. Maybe they'd just see forests and animals and an unremarkable blue planet orbiting an average yellow star. Think about what that means. When we look at each other across the gulf between galaxies, we're not just looking across space. We're looking across time. Andromeda and Earth are having a conversation, but the messages take 2.5 million years to arrive. By the time your reply gets there, everything has changed. That's one of the strangest and most beautiful facts in all of physics. And it speaks to something deeper about our place in the universe. Something that I think too many people miss when they talk about space travel and the future of humanity among the stars. We are small, unimaginably, incomprehensibly small. We live our lives measured in decades. We measure our journeys in hours, maybe days. We think a flight from New York to Tokyo is long. We think a road trip across the country is an adventure. And then you learn that the nearest major galaxy would take 4 trillion years to reach with our fastest technology and suddenly every distance you've ever traveled collapses into insignificance. The universe doesn't care about our ambitions. It doesn't care about our rockets or our blueprints or our five-year plans. Its distances are so enormous that they mock everything we consider fast or far or impressive. And yet here we are on a tiny rock in a quiet corner of one average galaxy among trillions of galaxies and we can look up and see Andromeda. We can calculate the distance. We can predict the collision. We can understand with math and physics and human ingenuity exactly why we can never reach it and exactly how it will someday reach us. That's not nothing. That's extraordinary. Let me leave you with a few things to carry away from tonight. First, the numbers. I want you to remember these because they put everything in perspective. The Parker Solar Probe, the fastest object humanity has ever created, would need 4 trillion years to reach Andromeda. A spacecraft traveling at 10% of light speed would need 25 million years. Even at full light speed, which is physically impossible to achieve, it would take 2.5 million years. And if none of that works for you, just wait about 4 to 5 billion years because Andromeda is drifting toward us anyway. Second, the physics. The speed of light isn't just a speed limit. It's a fundamental boundary woven into the fabric of reality itself. We can't break it the way we broke the sound barrier. It's not an engineering challenge. It's a law of the universe. And no technology, no matter how advanced, can violate the laws that govern everything. Third, and this is the one I want you to really hold on to, the beauty. The fact that you can walk outside tonight, look up at a faint smudge of light, and know that what you're seeing is a galaxy containing a trillion stars, whose light left two and a half million years ago, and which is slowly, inevitably falling toward your galaxy for a cosmic collision billions of years from now. That is the single most awe-inspiring thing a human being can experience with the naked eye. You will never visit Andromeda. No human ever will. And that's okay, because the point was never to get there. The point is that you can see it. You can understand it. You can stand on this little rock and comprehend something so vast and so ancient that it makes everything else feel like a footnote. And in a world where we spend so much time arguing about small things, tearing each other apart over politics and power, and who said what on social media, it's worth stepping back sometimes and remembering how small all of that is compared to the actual scale of where we live. The universe is under no obligation to make sense to us, but somehow, against all odds, it does. We cracked the code. We figured out the distances. We predicted the collision. We are a species that can look across two and a half million light years and understand what we're seeing. That is the greatest achievement of the human mind, not going there, knowing it's there. The next time you're outside on a clear night, look up, find that faint smudge of light, and know that what you're looking at is a message from the deep past crossing an impossible distance, arriving at your eyes at the speed of light after a journey of 2.5 million years. That light traveled through absolute nothingness, through voids and emptiness and silence for longer than our species has existed just to reach you. That's not failure. That's not a limitation. That's connection across space, across time, across everything. Make sure you're subscribed with notifications turned on because I've got more content like this coming. Stories that make you think. Stories that change the way you see the world. Hit subscribe. Hit the bell. And I'll see you in the next one. I'll be watching the sky. And so should you.