New answers tagged black-hole
2
Let me add an addendum to PM 2Ring's excellent answer.
Why does the New Scientist article (apparently) say that a low-mass primordial black hole is "a million times denser than the moon"? It's because it's not really referring to actual black holes, but rather to the fake black hole used in a simulation.
From reading the Yalinowich & Caplan (...
4
The smaller a 'regular', stellar-mass black hole is, the denser it is inside of its event horizon, correct?
Yes, that's correct. But the black hole density is a mean density, that is, it's just the mass of the BH divided by its Schwarzschild volume. It's not like there's a uniform ball of stuff inside the event horizon with that density.
I have also read ...
3
Time dilation with respect to a far away observer tends to infinity as you get close to the event horizon.
$$dt = {1 \over \sqrt{1- {r_s \over r}} }d\tau$$
Here $t$ is the time of a far away observer, $\tau$ is the time of an observer that hovers above the black hole at distance $r$, while $r_s$ is the Schwarzshild radius.
-1
Time dilation is dependent on Two ways
SPEED
Gravity
And is variable...
In regards to speed, the faster acceleration determines perceptable time movement.
Top 50 recent answers are included