Devise a way for the occupants of a spaceship to know whether they are being pulled into a black hole. What can they do if they determine they are within the Schwarzschild radius?
Astronauts riding in the space station are said to be in “zero-free” or “micro” gravity. Explain why this is not really so. Is the net force on them zero?
In the experiment discussed in Chapter 2 of the atomic clocks fl own around Earth, what was the effect regarding general relativity?
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