Black+Holes

Black Holes, What are they? Well basically it is an object that is so compact (in other words, it has eough mass in a small enough volume) that its gravitational force is strong enough to prevent light or anything else from escaping. It was not till the 18th century, when the existence of black holes was first proposed. The name 'black hole' was introduced by a man named John Archibald in 1967.

Originally black holes would look vary different from each other. But this is because of the varitey in what happens in their particular environment/sorroundings. Black Holes have three different characteristic properties, these are as follows;
 * the mass of the Black Hole (how much stuff it is made of)
 * its spin (weather and how fast it rotates around an axis)
 * its electric charge.

Stellar-mass black holes are born with a effect of a bang (explosion). They are formed when a very large star runs out of nuclear fuel (the star should be at least 25 times larger/heavier then our sun). The star will then explode into a supernova, if big enough a hypernova. What will be left after the explosion is the black hole.

Before the year 1974 black holes were thought to be impossible to destroy (die out). But thanks to the well known physicist and author Stephen Hawking, we now know that black holes actually evaporate by slowly returning their energy to the universe.