Planetary alignments: They’re the favorite astronomical scenario of kooks, con artists, and Hollywood producers everywhere. But has it ever happened? And what would it do to Earth if it did?
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Sources:
http://helios.gsfc.nasa.gov/qa_plan.html
http://www.universetoday.com/34076/planetary-alignment/
http://www.nasa.gov/topics/earth/features/2012.html#planets
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/961207a.html
http://science.nasa.gov/science-news/science-at-nasa/2000/ast30mar_1m/
http://helios.gsfc.nasa.gov/qa_plan.html#flip
http://curious.astro.cornell.edu/question.php?number=203
http://www.badastronomy.com/bad/misc/planets.html
http://content.time.com/time/health/article/0,8599,2070503,00.html
http://www.fourmilab.ch/cgi-bin/Solar
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