Here are some websites where you can learn about the Big Bang Theory:
http://www.astro.ucla.edu/~wright/cosmology_faq.html
http://www.hawking.org.uk/the-...of-the-universe.html
http://map.gsfc.nasa.gov/universe/bb_concepts.html
http://www.big-bang-theory.com/
http://cosmology.berkeley.edu/...Big_Bang_Primer.html
http://www.ugcs.caltech.edu/~y.../BigBang/BigBang.htm
http://csep10.phys.utk.edu/ast...ology/inflation.html