Why did't our earth become a black hole, since it is bigger than the smallest black hole?

Question

some one said a star with 10^8 kg can be a black hole.

Answer 1

A black hole can have just about any mass, in principle. It's just a matter of compressing it into a sufficiently small volume until it crosses a threshold where it continues to collapse on it own all the way to a singularity. There are no known processes in the present. universe, however, that can supply the required pressure, except for an exploding star about 4 times the mass of sun at the end of its life.

There was sufficient pressure shortly after the big bang that could have produced tiny black holes. Some of the relatively more massive ones (like the mass of a mountain) could have survived to today (black holes decay). No one's ever detected one, though.

Answer 2

First off, if everything the size of earth turned into black holes, the universe would have nothing except black holes in it.
Black holes form when the nucleus of a star, which has an extremely large amount of DENSITY, collapses due to its own weight into something so small that its density increases humongously.
If you remember somewhat basic equations, you will see that the density of an object is equal to its mass divided by its volume. So if you have a constant mass of let's say 1, then volume and density are INVERSELY proportional. This means, the more volume, the less density.
Black holes are so dense because of just that. They have the mass of a star's nucleus but the size of maybe a tenth of the earth or maybe much less (I'm not sure specifically how much).

Answer 3

If you mean in diameter, you're right. Even the smallest meteor is larger in diameter than the smallest theoretical black hole.
But a black hole is formed in the presence of a intense gravitational field and only a huge amount of mass can generate that intensity of a gravity well. So diameter or size doesn't count, its the amount of mass collected in one place that dictates if a black hole forms.

Even the smallest theoretical black hole, no larger in diameter than a proton, has as much mass as the dwarf planet Ceres all packed into that tiny space.
For Earth to become a black hole, it would only be about 1.7 centimeters in diameter.

Answer 4

It is not the size of the object, but rather the mass of the object, that is important.

An object with the mass of the Earth doesn't have enough gravity to become a black hole. However, a star a few times more massive than the Sun does have enough gravity to become a black hole.

Answer 5

Quite simply, the Earth does not have enough mass for it's core to be compressed to the point of collapse to form the black hole.

The sun also does not have enough mass, hence when it 'dies' it too will not form a black hole, but rather cool off slowly to form a white dwarf.

Answer 6

well, first the earth being a planet has an outward force being electron degeneracy, that counters the inward gravitational force, and this balance does not wane. however, a star will eventually under a change into a white dwarf, neutron star, or black hole depending on it's mass, because the outward force will not be able to counter the gravitational force.

Answer 7

the mass density of the earth is not high enough. Our sun, would have to be the size of a basketball to become a black hole, but it does not have enough mass to create the necessary gravity to make it collapse in on itself.

Answer 8

The above answers are correct. To put it in layman terms, if you assume a black hole is a small bowling ball, the Earth is just a big balloon. Yet it's the bowling ball, not the big balloon, that hurts your toe when you drop it.

Answer 9

the earth would need about 100 billon googles of beans and cornbread before it would become a black hole..
and only if it didnt hold in the fart and blow up first

Answer 10

because earth is a planet, not a star. Definitely not a star that has imploded.