Amazing Facts

Black holes

Black holes are arguably the strangest and most mysterious objects in the universe.
Their bizarre properties can challenge the laws of physics and even the
very nature of reality itself.

To understand black holes, we must learn
to think "outside the box" and use a little imagination. Black holes
are formed from the cores of super massive stars and can best be
described as regions of space where so much mass is concentrated that
nothing, not even light, can escape the gravitational pull. It is an
area where the escape velocity is greater than the speed of light.

The more massive an object is, the faster you have to travel to escape its
gravity. This is known as the escape velocity.

Black holes are so
massive that their escape velocity is faster than the speed of light.
Since nothing can travel faster than light, nothing can escape the
gravity of a black hole. It was Einstein's general theory of relativity
that provided the first clue to understanding black holes. His theory
also states that gravity affects time. The more massive an object is,
the more it can slow down time.

The gravity of a black hole is so great
that time nearly stands still. If you were on the outside of a black
hole watching a spaceship fall in, you would see the spaceship appear
to slow down until it finally disappears. A common myth about black
holes is that they will suck in all matter around them. This is not
true. They will suck in matter within a certain distance from them, but
beyond that, they act no differently than a massive star.

If our Sun could become a black hole, the planets would continue to orbit around
it the same as they do today.

Related Tags: Planets  Stars  Black-holes  
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