When a black hole has finished squashing,?

Question

how big will it be?

Answer 1

Hate to say this, but "it depends." A star has to be approximately three times bigger than our sun to have the potential to form a black hole (this is known as the Chandrasekhar limit). When the star goes supernova, a portion of its mass collapses to the point where gravity overcomes material structure, and it keeps on collapsing into what physicists call a "singularity." The hole is no bigger than the point of a pin -- it's literally a rip where the black hole disappears from our universe.
But every black hole has what physicists call an "event horizon." This is a spherical border. This is admittedly oversimplifying the answer, but here's the basics: Anything that crosses the event horizon cannot escape the black hole's pull -- not even light. As the black hole "feeds," it grows more massive. The more massive the black hole, the bigger the event horizon becomes. A typical black hole will have an event horizon approximately the size of our moon.

Answer 2

It is a slightly more complicated situation than that.
When a black hole has finished collapsing, it is actually a singularity - a point of zero volume and infinite density, with all the mass of the former star containing "within" it.
However, there is the "event horizon" - which is the distance from the singularity within which it is impossible for anything to escape. This distance - which *could* be considered the "size" of the black hole is based on the mass of the original star, and the distance is called the "Schwartzchild Radius". It can be calculated using this formula:

r = 2Gm/C^2

Where r = radius, G = gravitational constant, m = mass, and c = speed of light (also a constant).
(so the radius is equal to twice the gravitational constant times the mass, all over the speed of light squared)

Since G and c are both constants, the value of 2G/c^2 is also a constant, equal to roughly 1.48×10^−27 m/kg.
So, the Schwartzchild radius (in metres) of any body is that value times the mass in kg.

For the Earth, this gives a radius of roughly 0.9cm.

Answer 3

The size of a black hole is set at the moment it comes into existence, but grows or shrinks as the hole gains or loses mass. The diameter of the event horizon can be calculated as 4Gm/c^2, where G is the universal gravitational constant, m is the mass of the singularity, and c is the speed of light. You can simplify this to approximately d=6M, where d is diameter in km, and M is the mass in solar masses. So a black hole with the mass of a billion Suns would have an event horizon diameter of 6 billion km, which is somewhat beyond the diameter of the orbit of Pluto.

This is the diameter within which nothing can escape the black hole's gravity. The actual size of the mass is indeterminate - it can't be calculated because it's in a state beyond the laws of physics as we know them.

Answer 4

I think your understanding of black holes is a little off. A black hole doesn't "squash" It is just a vast well of gravity. To understand this properly you need to fully understand the nature of gravity. All matter has gravity the more matter the more gravity. A black holes "squashing power" lies in the amount of matter it has within it, this determines how big it is, and it never stops "squashing"

Answer 5

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Answer 6

Well it depends entirely on how much mass the black hole has consumed -- the more mass it's 'squashed' the bigger it will be.

Answer 7

a black hole is the universe they merge devouring everythingthey dont grow in size they get stronger everything will be as the beginning was before the big bang

Answer 8

it can be so big tht it can be the size of Jupiter...... but u cat c a black hole!

Answer 9

An infinitely small point

Answer 10

Proper macca!