can someone help me understand black holes...
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The gravitational force at a certain radius before and after collapse into a black hole shouldn't be any different. Any planet in orbit around a star collapsing into a black hole would continue orbiting like nothing happened (assuming there wasn't a supernova explosion or something of this nature).
However your question assumes we can measure the gravity at 10 km from the center of the star before it collapses. In this case you would be inside the star and the force of gravity would be different (lower than the surface actually). See Shell Theorem.
As to whether any stars close to us that could become black holes, from what I know its very difficult to spot black holes, so its possible we fill find more in the future. The closest candidate is A0620-00 and is about 3000 light years away.
Massive O type stars like Rigel (blue supergiants) typically live the shortest lives (a million or so years) and are the best candidates for upcoming black holes. But the supernova is probably the bigger threat than the black hole itself (which won't start sucking everything up).
blackholes:
gravitational waves were recently discovered ...does it has something related with the holes...???
did u copied it from wikipedia???
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Well Simply a Black Hole is a region where Space & Time are meeting each other having such a powerful effect of Gravity that sucks everything in leaving nothing behind as no one or thing can escape from it..............
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does gravitational waves has anything to do with the black holed
holes**
Yes it does. It is the main Reason of such a Powerful Gravitational Effect............
but gravitational waves were discovered recently...so...when we knew that gravitational waves are resposible for such a powerful effect...then...why these were discovered so late????
It has been said only after they were discovered.
These were discovered late probably because the Scientists did not have an example or a method to discover them.
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