What would happen if you fell through the center of the earth? On this explainer, Neil deGrasse Tyson and comic cohost Chuck Nice take another look at transportation and explore the concept of gravity trains: trains that are purely propelled by gravity.

Ever been digging a hole, minding your own business, and heard someone say you’re digging a hole in China? Find out why, if you dug through the earth, you would probably not end up in China. What would happen if you jumped into that hole and fell through the earth? Neil walks us through the physics of what would happen. Would you get vaporized? Stuck? Ejected from Earth? What about if the hole wasn’t through the center of the earth? We discuss swisscheese Earth and what would happen if there was an underground train through the earth that went directly between New York and California. All that and more, on another StarTalk explainer!

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About StarTalk:
Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic cohosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!

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0:00 Introduction
0:26 Digging Through the Earth
3:05 Jumping Through the Hole
8:49 Gravity Trains
11:36 Closing Notes