Wikimedia
Wikipedia: The Black Hole
This site examines the black hole as an object in astrophysics. Delve into this comprehensive resource that covers this concept from its history, to qualitative physics, the reality of black holes, mathematical physics and more.
Treehut
Suzy's World: Black Holes
Use this site to find out what is a black hole in space and try an experiment.
American Museum of Natural History
American Museum of Natural History: O Logy: It's All Relative
Learn about the 4th dimensions and the theory of relativity.There is no absolute, or "same," time and space. This means time and space are different for everyone! How you experience events in time and space depends on two important...
Scientific American
Scientific American: Einstein's Hot Time
This article, published by Scientific American (September 2002), re-publishes a short paper by Albert Einstein which "explains" relativity to the layman the pretty girl/hot stove abstract.