Black Hole Hunting

Posted May 7, 2021 19:49 UTC (Fri) by Wol (subscriber, #4433)
In reply to: Black Hole Hunting by hummassa
Parent article: Development quote of the week

And wikipedia says the Schwarzchild radius is the event horizon - which is what I said.

As a star collapses and gets smaller (and more massive) so the Schwarzchild radius grows, and as the star shrinks inside the Schwarzchild radius it turns into a black hole.

Hence my statement that the black hole itself gets smaller as it gets more massive. After all, relativity assumes it collapses into a singularity (yes I know this is where relativity collides with Quantum Mechanics, and we don't actually know how to reconcile it).

Cheers,
Wol

Black Hole Hunting

Posted May 8, 2021 11:59 UTC (Sat) by hummassa (subscriber, #307) [Link]

As I understand the theory it's not really appropriate to talk about the "size" of something after it is closer to the center than Rs. By general relativity, either you consider that the radius of the star is Rs (directly proportional to its mass) or you consider it's zero (independent of its mass).

But IANAA (astrophysicist).