Why do black holes have such strong gravity?

In my live video chat, I was asked, why do black holes have such stronger gravity than the stars they formed from?

Here's my answer.

Category:

Science & Technology

Tags:

• bad
• astronomy
• phil
• plait
• black holes
• gravity
• stars

[insanesportskid]

u should replace my science teacher lol she sucks. u make learning fun

[MrFirefly1337]

I will now post a comment...of science.

[JesusHareChrist]

they have such strong gravity because...mass has weight. Therefore gravity. A black hole is extremly condensed mass. So it pulls stuff in. Easy as that.

[USAon3]

@mVhV0 it's like this... Our whole universe was in a hot dense state, Then nearly fourteen billion years ago expansion started-- Wait! Then the Earth began to cool, The autotrophs began to drool, Neanderthals developed tools, We built a wall (we built the pyramids), Math, science, history, unraveling the mysteries, That all started with the BIG BANG! That should clear up some things. Glad to be of service.

[Forget29it]

doesn't black hole tore the fabric of space making it the most powerful natural vacuum in space wouldn't that mean it have stronger gravity than the sun it previously collapse

[mVhV0]

but i wonder why the black hole keeps mentioned four miles radius not collapsing all the way into zero? what force keeps against it?

[cobloaf1]

@TheCrimsonIdol987 That, I understand. What I got caught up on was when Phil said that if a star exploded and expelled its outer layers (losing mass), it's gravity would still be the same. In his example we go from 20-40 solar masses down to just 4. I understand the potential for gravitational effect (GE) increases because you can now get closer, but wouldn't it's GE at a distance (the same distance you had before the star exploded) be weakened? I hope that makes sense.

[CharlieTeague]

@Znyggisen

I meant it's very small, I am aware there is a tiny bit of red.

[alaric63]

I know I haven't been to college and I have been rather... made fun of you in the past... but check this out. my comment was from a long time ago, and black holes, like most of 'astronomy's' things.. newtonian things.. out there...

are in fact,

Hypothetical.

This is what worries me Phil.

There is new, good, evidence that is being ignored, increasing the ignorance of americans.

You are in the 'university' scene,

You tell me.

?

[Znyggisen]

@CharlieTeague you must be blind.

[TheCrimsonIdol987]

@alaric63: Black holes are not fiction, they are very real.