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Before answering this question, I must explain what gravity is (Albert Einstein's theory).
Gravity is the deformation of space-time. Imagine space-time as a mattress. Place a heavy ball on the mattress. What will happen? The mattress will be deformed by the ball. Now roll a little ball on the mattress. What will happen? The ball will approach the heavy ball because of the deformation and will begin to rotate around the heavy ball.
N.B.: It is important to know that gravity and time are the same thing. The more space-time is distorted, the more time passes quickly.
N.B.: A planet that is smaller than another planet but has the same mass will deform more space-time.
Now that you know what gravity really is, I can begin to explain how black holes are created.
Every normal star has balance between its gravity and the pressure in its center. When a big star dies, the balance between the gravity and the pressure is destroyed: the gravity is stronger than the pressure. The star begins to collapse on itself. The mass remains the same, but the density increases. Because of that density, the space-time deforms more and more. In some time, the density of the star is so high that space-time rips. This zone is now called "Black hole".
Most galaxies have super black holes in their center. Scientist doesn't know how they were created.
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∙ 13y ago
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What happens to stars that are black holes?
They will remain as black holes for a long, long time.
Are dead stars black holes?
Yes. They get sucked into black holes all the time!
What is bigger black holes or asteroids?
Black holes. They can be so large that they can suck up universes at a time
Could black holes be time warps?
Black holes do distort time. The closer you get to the event horizon of a black hole, the slower time goes. From the perspective of someone outside, time at the event horizon stops.
When can black holes be found?
At any time.
What can you say about black holes?
Black holes were stars that were so massive that they collapsed on itself. The gravity in black holes is infinite and more you get closer to it, more time gets slower. Black holes suck all matter that is too close. Even light can't escape Black holes.
What is a black holes average life span?
Science at this time can find no end to black holes. They seem to last forever.
Can black holes alter time?
Can black holes alter time? Probably... I mean a black hole interfears with time and space... maybe... just maybe.... we could go either to the future or back to the... past.
Were there any sightings of white holes or black holes in the last 100 years?
Black holes have been detected (or at least evidence of their activity) White holes have never been observed, and remain theoretical for the time being.
Did galaxies form around super massive black holes?
It's generally believed that galaxies first formed around "ordinary" black holes and over time, they grew into super massive black holes as stars were slowly "consumed" by the black hole.
Is there a certain time of year black holes form?
Black holes are outside the confines of both the Earth and the Solar System, the passing of our year does not affect when they form.
What if two black holes pulled on each other if both the black holes started at the same time?
They would get closer and closer together until they merged.
