New discoveries into two weird things that may have played havoc with the ancient solar system: dark matter and a wandering star.
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Sources:
http://www.forbes.com/sites/ericmack/2015/02/19/extinctions-on-earth-could-occur-on-a-schedule-set-by-dark-matter/
http://mnras.oxfordjournals.org/content/448/2/1816.full
http://www.nature.com/news/did-dark-matter-kill-the-dinosaurs-1.14839
http://arxiv.org/pdf/1403.0576v1.pdf
http://adsabs.harvard.edu/full/2004MNRAS.355…51Y
http://www.nature.com/nature/journal/v308/n5961/pdf/308713a0.pdf
http://www.nature.com/nature/journal/v308/n5961/pdf/308715a0.pdf
http://www.pnas.org/content/81/3/801.full.pdf
http://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy/
http://www.rochester.edu/newscenter/scholz-star/
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