How long till a black hole?

Answer 1

Now technically it would depend on how close the black hole was to say a cluster of stars, if it was in the center of millions of stars and was about 1 star or more in diameter it would suck them all up! but otherwise no one knows considering we have only searched about 1 millionth of the night sky!

Answer 2

We don't know how long black holes last, but we do know that the glow seen from outside a black hole carries energy and decreases the black holes mass; eventually destroying the black hole.

Answer 3

It depends on many factors: size of the star and the rate at which the black hole would devour the star i.e. tons per second...,

Assuming the star being "eaten" is about the Sun's size: 2 octillion tons (2x1027 )and also assuming the black hole "eats" at the rate: 1 trillion ton per second (1012 )

Then it would take 2X1015 seconds or 555,555,555,555 hours or 23,148,148,148 days or 63,419,584 years, about the time when dinosaurs went extincted to today (21st century).

If the black hole "eats" faster then it would take less time or if the star is bigger than the Sun then it would take longer, vice versa.

You got the picture.

Answer 4

Not sure what you mean by a "dead" star, but it takes a matter of seconds for a star, large enough to end up as a black hole, to undergo the core collapse that we see as a Type II supernova. In other words, a "dying" star turns into a black hole rather rapidly.

If a star instead ends up as a white dwarf, it will take trillions of years, if not longer, for that star to end up as a black dwarf -- which is VERY different from a black hole. The only thing these two objects have in common is the word "black."

Answer 5

When a supernova explodes, if it is powerful enough, the core of the star is crushed under unimaginable pressure to a density so high that even the nuclear pressure that keeps neutrons from squashing together is overcome, and the mass becomes a point - the mass of a star crushed into something smaller than a grain of sand. We really don't understand what process takes place, but our math indicates that it takes essentially no time at all to happen.

Answer 6

Depending on the mass of the black hole and the mass of the star, anything from thousands to millions of years.

Answer 7

10^15 years for a regulary Black Hole

10^ 28 years for a mini Black Hole

10^5 years for a super black hole

Answer 8

Once a star is a black hole, it can never change.