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Frederick, R. (2008). Space
Yeomans, D. (2010). NASA Near Earth Objects Project. http://neo.jpl.nasa.gov/neo/#intro
Ando, D. (2010). An Introduction to Black Holes http://design.lbl.gov/education/blackholes/index.html
Bunn, T. (1995). Black Holes http://cosmology.berkeley.edu/Education/BHfaq.html#q10
Cain, F. (2008) Will Earth survive When the Sun becomes a Red Giant? http://www.universetoday.com/12648/will-earth-survive-when-the-sun-becomes-a-red-giant/
Minard, A (2009). Gamma-Ray Bursts Caused Mass Extinction? http://news.nationalgeographic.com/news/2009/04/090403-gamma-ray-extinction.html
7mate.(2010). The Universe (TV show)
Plait, P. (2010). Top 5 Ways the Universe Could Wipe Out Humankind http://www.popularmechanics.com/science/space/deep/5-ways-the-universe-could-wipe-out-humankind
Jenkins, J. (2010). What is the Galactic Alignment in 2012 http://www.bibliotecapleyades.net/esp_2012_03.htm
