Introduction An average galaxy is thought to contain over a hundred billion stars. A hundred billion galaxies are thought to exist in the universe. That adds up to a lot of stars. Where do these stars come from? How do they form? Why are some stars brighter than others? How does the sun get and generate power? One of the great discoveries of modern science is that stars live only for a measurable amount of …showed first 75 words of 1594 total…

…showed last 75 words of 1594 total…Life Cycle of Stars. NASA: Goddard Space Flight Center. Retrieved from, http://map.gsfc.nasa.gov/m_uni/uni_101stars.html Hathaway, D. H. Dr. (2003, December 12). WMAP Cosmology 101: Life Cycle of Stars. NASA: Marshall Space Flight Center. Retrieved from, http://science.nasa.gov/ssl/pad/solar/whysolar.htm Kornreich, D. (January 1999). Curious About Astronomy: What is the life cycle of a star? Ask an Astronomer. Retrieved from, http://curious.astro.cornell.edu/question.php?number=38