Pro-Test
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TIME REMAHIING
58:25
Which excerpt from Neil deGrasse Tyson's "Death by Black Hole'
best provides evidence that escape from a black hole
impossible?
the speed required to escape black hole is greater than the speed of light itself. ... light travels at exactly
299.792.458 meters per second in a vacuum and is the fastest stuff in the universe.
But if the black hole were 6,000 feet across, then the same man's feet would be only one-tenth of 1 percent closer to
the center than his head, and the difference in gravity-the tidal force-would be correspondingly small,
Meanwhile, the stuff within the event horizon has collapsed to an infinitesimal point at the black hole's center. So
black holes are not so much deadly objects as they are deadly regions of space.
If you stumbind upon a black hole and found yourself falling feet-first toward its center, then as you got closer, the
black hole's force of gravity would grow astronomically.
