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What if the Earth suddenly turned flat?

posted by Jason Kottke   Jun 23, 2017

Disc Earth

We all know the Earth is (nearly) spherical. Wellllll, not everyone does. So what if our planet did suddenly turn flat? Gizmodo recently asked a bunch of scientists this question and the answer came back: certain death for all life on Earth. More specifically, seismologist Susan Hough says:

If the earth were to suddenly flatten, presumably all sorts of hell would break loose. I guess it would depend on how flat is flat. If we’re talking pancake flat, gravity would be an immediate problem: gravitational attraction goes as G(m1*m2)/r^2, where G is the gravitational constant, m1 & m2 are two masses, and r is distance. A sphere is the 3D shape that maximizes surface area relative to volume, which kind of gives gravity the biggest bang for its buck. If you flatten the sphere, the far side gets closer to the new center point, but the ends spread way out, so surface gravity goes down at the center, and way down at the edges. Lose gravity and bye-bye atmosphere.

Other first-order problems: heat, radioactivity, etc. In our spherical earth, both of these are concentrated in the core. If the earth were flattened, they would have to go somewhere-presumably a lot closer to the surface.