Black+holes

A **black hole** is a region of space in which the gravitational field is so powerful that nothing, including light, can escape its pull. The black hole has a one-way surface, called an event horizon, which objects can fall into, but nothing can come out of. It's called a black hole because it absorbs all all the light around it and reflects nothing. This is why people haven't really seen one up close, and wonder if they are real. (A simulated view of a 10-solar-mass black hole 600 miles away from the observer, and against the plane of the Milky Way Galaxy)

Black holes-star systems differ in two major ways from a planet-satellite system. One of the ways are that in a planet satellite system, the orbit of a cometary star tends to be in a circular path, while the orbit of a cometary star, in a black hole system, stretches in the direction of the black hole. The second important part of the black hole star system is the nature of the object subjected to tidal forces. As in, objects made of gas are more easily heated by the tidal forces rather than an object made of rock (__Black Holes__, book by: Jean-Pierre Luminet)

There is a theory of "white holes", in which some believe is an opposite of a black hole; and it exists of the other side of a black hole. But this is merely a myth and more along the lines of a plot for a science fiction film. ( http://burro.astr.cwru.edu/stu/advanced/stars_blackhole.html)

by Mass** ([])
 * Classification of Black Holes
 * 1) **Supermassive -** Contains hundreds of thousands to billions of solar masses
 * 2) **Intermediate -** Contains thousands of solar masses
 * 3) **Stellar Mass -** Contain masses ranging from about 1.4-3 solar masses to about 15-20 solar masses
 * 4) **Micro** - Contain masses smaller than a star

PLEASE SEE FRONT PAGE OF WIKI FOR MORE INFORMATION ON BLACK HOLES