Would touching a black hole of a small mass (the mass of an apple) cause you to spiral in and get dead?
Why isn't an infinite, flat, nonexpanding universe filled with a uniform matter distribution a solution to Einstein's equation?
Why don't we put satellites into an orbit where there is (almost) no time dilation/contraction compared to Earth's surface?
What does general relativity say about the relative velocities of objects that are far away from one another?
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