What Earth do you live on? A round one? Flat one? Maybe your world is resting on the back of a huge cosmic turtle? What about a hollow Earth? Just a planet’s shell levitating around absolutely nothing. How would the laws of physics work on that hollow Earth?

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“Imagination will often carry us to worlds that never were. But without it, we go nowhere.” — Carl Sagan

If you enjoy What If, make sure to check out our other channel “Underknown”:

Produced by Underknown in Toronto, What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure — grounded in scientific theory — through time, space and chance, as we ask what if some of the most fundamental aspects of our existence were different.
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