Hey Vsauce, Michael here. In 2003, researchers did the measurements and found that Kansas is in fact literally flatter than a pancake. Of course, the Earth is not flat, the Earth is round.
Otherwise, travelers would be falling off the edge all the time. Right? Wrong.
If the Earth was not a ball shape, but was instead a flat disk, like this plate, well, with the right density and thickness, living in the middle could feel pretty normal. But as you moved toward the edge, gravity on a disk Earth would slightly skew, pushing at a great greater and greater angle back toward the center. My friend Nick from Yeti Dynamics put together this great simulation.
The person and buildings obviously aren't to scale, but check out how such increasingly diagonal gravity would work. Although this is a flat disk, it would feel to a runner headed toward the edge like they were fighting to climb up a steeper and steeper hill. The building foundations behind the runner reflect how you would have to build structures closer and closer to the edge. edge so that people living in them always felt like down was at right angles to the floor, the way we feel it on our big round earth. Now as you approach the edge, things would get scary.
Remember, this is a flat earth, but it would feel like a sheer drop off. What's really cool is that contrary to the don't fall off the edge fear, on a flat world, because of gravity, the scary risk would actually be falling away from the edge and rolling all the way back to the center. Once you stepped over the edge, instead of falling off into space, you'd be able to relax. It would be a nice level place. This model, of course, neglects the fact that such a planet shape would be impossible.
Anything as massive as the Earth, shaped like a flat disk, would, under its own gravity, naturally collapse back into a ball. This is why in outer space, everything more than a few hundred miles in diameter is round. Or so we've been told. What if gravity isn't real? What if the Earth is in fact flat, and science has been wrong all along?
It's a misconception that Christopher Columbus discovered that the Earth is round. Virtually every scholar and major religion in the West accepted Earth's rotundity since at least the time of the ancient Greeks, who for instance had noticed that boats disappear bottom first when sailing away, and as you walk north and south, stars pop into and out of view. The misconception that only a few hundred years ago lots and lots of people believed the Earth was flat likely began in the modern era as a sort of insult, a, well, your people recently thought the Earth was flat so why should we believe you now?
The smear was repeated and published so often it became accepted as historical fact. Flat earther became synonymous with anti-science. It might seem flat over short distances, but over longer ones, well, the Earth is pretty darn curvy.
The Verrazano Narrows Bridge, connecting Staten Island and Brooklyn, had to be designed with Earth's roundness in mind. Its two towers, separated by 1300 meters and perfectly vertical, are nonetheless 41 millimeters further apart at the top than at the bottom because of Earth's curvature. In the 3rd century BC, a range of Eratosthenes measured the differences between shadows cast by poles in Syene and Alexandria to calculate more than 2,000 years before rockets and space travel the circumference of the entire globular Earth, with for the time, impressive accuracy. Word got around that the Earth was a round shape after that, but in 1906, Wilbur Glenn Villava became head of a slightly bizarre religious sect that pretty much ran the city of Zion, Illinois. Villava believed that the Earth was actually flat, and he enforced flat Earth teachings in schools in Zion.
He also enforced that belief on really anyone who entered the city. Vallava believed not only that the Earth was flat, but that the Sun was only a few thousand miles away from Earth. Not 93 million.
He also believed that the Sun was only 32 miles across, not 860,000. He sounds crazy. Or does he? You see, the same phenomenon Eratosthenes measured could be explained by a flat Earth, if the Sun were only a few thousand miles away and 32,000 miles across. 32 miles across.
The math would work out the same. Today, with the power of the internet, modern-day flat earthers have picked up where the lava left off. They have quite good explanations for any evidence you throw at them. that the Earth is round. Circumnavigation is really just a flat circle path.
The round shadow Earth casts on the moon during a lunar eclipse could also be made by a flat disk. Time zones are caused by a spotlight sun. And remember how gravity would be totally different on a disk-shaped planet? Well, they argue that gravity as we know it simply doesn't exist.
The flat disk of Earth is merely accelerating up at 9.8 meters per second. As for all of the photos and video evidence we now have that the Earth is round thanks to space exploration, well all of that material is completely fabricated. A hoax perpetrated by Big Globe.
Space agencies, airlines, globe manufacturers, they are reaping the rewards of our ignorant belief that the Earth is actually round. They know, of course, that it's flat. And they're hiding that truth from us.
Is it merely a coincidence that the logo used by the Flat Earth Society is a projection of Earth centered on the North Pole and also happens to be the projection used by the United Nations? Are these people for real? Probably not most of them, but this is the crux of Poe's Law. An adage that states that at their extremes, parody of extremism and sincere extremism are difficult to distinguish.
Although clever, flat earth theories are predominantly ad hoc explanations, excuses made up on the spot that only address one issue and don't fit all the evidence. Science, of course, rejects a theory if a better one fits more of our observations. But why the egotistical obsession with our observations? A cosmic ray particle could use the very same scientific method we use and conclude that the Earth was, in fact, flat. You see, at speeds near the speed of light, time slows down and lengths contract.
One way we know this is that unstable muons created in the upper atmosphere by the collision of cosmic rays with the atmosphere should mostly decay before reaching Earth's surface. But yet, we detect a lot of them down here. Because their crazy fast speed literally means that from our perspective, their physics runs according to a slower clock. And to them, the distance they have to cover to the surface during their short lives is, from their perspective, Much, much shorter than it appears to us.
If you were a cosmic ray proton traveling at 99.99999999991% the speed of light, Earth would appear to be only 17 meters thick in the direction you traveled. So Earth is flat to them, but round to us. It is ball-shaped to some observers and flat to others.
There doesn't appear to be a single most correctest in all circumstances answer. Susan Hack compares knowledge to a crossword puzzle. New answers interweave with old ones.
They all reinforce one another. The clues are the questions we ask. And the way the answers fall into a predetermined grid, well, that's our confidence that we're on the right track.
But that doesn't mean that one day there will be a finished puzzle, a complete answer. Recall the New York Times famous 1996 crossword puzzle that came out the day before the US election between Bill Clinton and Bob Dole. The clue for 39 across was pretty crazy. You seem to need to be able to tell the future to answer it correctly. It simply said, Lead story in tomorrow's newspaper.
Blank elected. Well, that blank could be Clinton or Bob Dole. And who's to say which one until tomorrow? There's no way to know.
But as it turned out, the answer was Clinton or Bob Dole. No matter which you wrote in, all the other clues fit. For instance, a black Halloween animal could either be a cat or a bat.
Our knowledge about the outside world might be the same. A puzzle with no answer key, just the reassurance that the answers we think we know fit together. So they're probably correct.
Though there's always the possibility that the answer to one clue or all of them will fundamentally not have a single definite satisfying answer. The puzzle may be playable forever. I like what Richard Feynman says about this. Some people say, how can you live without knowing?
I do not know what they mean. I always live without knowing. That is easy. How you get to know is what I want to know.
You know? And as always, Thanks for watching.