Black Holes are the result of collapsed stars that are more than approximately 4 solar masses. Although stars, planets, moons, galaxies etc. all have thousands of distinguishing characteristics, black holes only have three (this was a theory entitled "Black Holes Have No Hair" created by John Wheeler).
The three characteristics are: mass, charge and angular momentum (the last is related to spin). A Schwartzschild black hole is a black hole with only mass, and neither of the other two characteristics. These black holes have an even gravitational well and a gravitational singularity shaped as a dot. Also, these black holes are perfectly spherical, and have a fixed event horizon radius. However, these holes are rare, and usually black holes are much more complex. More info on black holes can be found here, here and here.
Tuesday, May 20, 2008
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