Bibliography
1999-2006. "All About Supernovas". Imaginova Corp.(http://www.space.com/supernovas)
1997-2006. "Black Holes" . NASA (http://imagine.gsfc.nasa.gov/docs/science/know_l2/black_holes.html)
2005. "Black Hole" and "Supernovae". Merriam-Webster Incorporated (http://m-w.com/dictionary/blackhole) and (http://m-w.com/dictionary/supernova)
Dinwiddle, Robert, et all. 2005. "Universe". New York: DK Pub.
