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James L. Green
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James L. Green Director, Planetary Science Division, National Aeronautics and Space Administration
TRANSCRIPT:
Well, you know the Big Bang, although that's astrophysics and it is the beginning of the universe, is really believed to be that time at which the universe started. Matter was expelled from a central location, flung out in every direction and, of course, for many years one of the next exciting questions was, "Is there enough gravity to bring it back and start the process again?"
From a philosophical point of view that might seem very satisfying, that there's a cycle there, but of course we now know that the remnants from that initial explosion we call the Big Bang do not have enough mass to bring matter back. So, the ultimate fate of the universe is to evolve to a point of lower and lower temperatures as these things move further and further apart.
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What do the letters in E=MC² stand for?
Answered by Science Channel
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What's a Shapiro delay?
Answered by Science Channel
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How could Kerr black holes be used for time travel?
Answered by Discovery Channel
