# Black hole and its density

I'm an amateur to astrophysics but I'm slowly teaching myself things and I have these three doubts.

1. How does more compression relate to a stronger gravitational pull. Like, when we say that a black hole is a tiny space that has 20-30 suns compressed in it, how does this increase its gravitational pulling power (I'm open to mathematical answers but I prefer a layman type answer for better understanding)

2. How deep a does a black hole go i.e. what is its depth? And when we say the black hole "sucks" anything "into it", how much can it "suck"? Is there a limit after which the black hole stops consuming anything in its path?

3. Are there factors which decrease/increase the strength of the gravitational pull of a black hole over time? Or does it remain as it is for eternity?

Apologies for the long question.

• – rob
Apr 16 '19 at 15:09

• @noorav As J. Murray said, you stop falling when you reach the centre, which for a stellar mass BH happens in a fraction of a millisecond, according to your local measurement of time. But before you reach the centre, you're spaghettified by the tidal force: if you're falling feet first, the gravity at your feet is higher than at your head. As you get closer, even your atoms are ripped apart. With a SMBH, you can cross the EH before that process is noticeable, for a 20-30 M$_\odot$ (solar masses) BH, spaghettification starts before you cross the horizon. Apr 16 '19 at 16:36