Feb. 15th, 2020

dreamer_easy: (*cosmic code authority)
"According to general relativity, the inward gravitational collapse never stops. Even though, from the outside, the black hole appears to stay a constant size, expanding slightly only when new things fall into it, its interior volume grows bigger and bigger all the time as space stretches toward the center point. For a simplified picture of this eternal growth, imagine a black hole as a funnel extending downward from a two-dimensional sheet representing the fabric of space-time. The funnel gets deeper and deeper, so that infalling things never quite reach the mysterious singularity at the bottom. In reality, a black hole is a funnel that stretches inward from all three spatial directions. A spherical boundary surrounds it called the “event horizon,” marking the point of no return." -- What Keeps Black Holes From Expanding Everywhere? (The Atlantic, 10 December 2018)

Great horny toads!

(Cf the behaviour of space-time in the Big Rip, and the volume of negatively curved space.)

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