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Question #3

What is on the other side of a blackhole

There is no other side.

Science fiction has populated the idea that a black hole serves a portal to another world. If you could pass through, where does a black hole go? Perhaps you'll come to some other dimension, or re-emerge from some other part of the Universe?No, a black hole only leads to death, for you, your spaceship, and another else that's unlucky enough to fall in.

http://www.universetoday.com/2008/05/05/what-is-on-the-other-side-of-a-black-hole/

Question #2

How big are black holes...?

Scientists have been able to tell how big a black hole is. They have effectively measured a black hole and it has the mass of 3 billion suns. That mass is equal to about 300 million kilometers. Thats a big black hole. But black holes vary in size there not always the same.The smallest is the micro or "mini" black hole.

http://answers.ask.com/Science/Physics/how_big_is_a_black_hole

Question #1 Black Holes

What causes black holes...?

A black hole is caused by an intense amount of gravity. Usually this occurs when the gravity of a star is so strong that it causes the star to collapse on itself. Once this happens, the gravitational force is so strong that light is even trapped inside. so when a star dies a black hole forms.

http://answers.ask.com/Science/Physics/what_causes_a_black_hole