Quote:
Originally Posted by dcl
As the star approached the event horizon, matter would begin to flow in an initially narrow stream from the star toward the black hole because of tidal forces.
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But the question seems to relate to a star collapsing to
become a black hole, not a star
approaching a black hole.
Quote:
Originally Posted by dcl
Aside from the apparent acceleration of time for him, he would notice nothing unusual if his own dimensions were small compared with the diameter of the black hole. In fact, he'd notice nothing different at all when he passed through the event horizon. On the other hand, if the diameter of the black hole was comparable with his own height, he would experience forces tending to compress him into a much smaller size.
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I'm not sure what you mean by "comparable", here.
A solar-mass black hole, with a Schwarzschild radius a thousand times the height of an adult human, applies tidal forces on the order of a billion
g along the length of a free-falling adult human crossing the event horizon. A 100,000 solar-mass black hole, with a Schwarzschild radius 100 million times the height of an adult human, produces manageable tidal forces on the order of a tenth of
g under the same circumstances.
I'm not sure if the word "comparable" is appropriate when multiplication constants greater than a million are involved.
Grant Hutchison