NASA
Nasa Cosmology: The Study of the Universe
Cosmology is the study of the "large scale properties of the universe as a whole." In this set of sites, NASA provides information on the Big Bang Theory in a simplified language. The beginning, evolution, structure, fluctuations and...
NASA
Nasa: Universe 101: Big Bang Theory: Big Bang Cosmology
Provides a brief explanation of the Big Bang Theory and the two theories on which it is based - the theory of general relativity and the cosmological principle. Links to a related page with more detailed information about the Big Bang...
Other
Montana State Univ.: Expanding Universe (Lesson Plan)
This site has a lesson plan in which students gather evidence supporting the Big Bang Theory using a balloon model of the expanding universe.