My sources for this web site are:

• The SETI Institute FAQ: http://www.seti-inst.edu/faq.html
• Imagine the Universe! Dictionary: http://imagine.gsfc.nasa.gov/docs/dictionary.html
• Big Bang: http://www.lifeintheuniverse.com/bigbang.html
• Big Bang: http://liftoff.msfc.nasa.gov/academy/universe/b_bang.html
• Hubble Snapshot Captures Life Cycle of Stars: http://oposite.stsci.edu/pubinfo/pr/1999/20/index.html
• stellar: http://www.umich.edu/~gs265/star.htm
• Life Cycle of Stars: http://library.advanced.org/17940/texts/star/star.html