Meet one of the newest celestial bodies to be discovered: rogue planets, worlds that hurtle around the galaxy without any parent star. Caitlin Hofmeister explains how we found them, and where we think they might have come from.
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Sources:
https://astrobiology.nasa.gov/articles/2011/05/18/free-floating-planets-may-be-more-common-than-stars/
http://www.jpl.nasa.gov/news/news.php?release=2011-147
http://www.ifa.hawaii.edu/info/press-releases/LonelyPlanet/
http://www.space.com/11699-rogue-alien-planets-milky-common.html
http://phenomena.nationalgeographic.com/2014/03/13/a-guide-to-lonely-planets-in-the-galaxy/
http://www.sciencemag.org/content/290/5489/103.abstract
http://arxiv.org/abs/1105.3544
http://io9.com/astronomers-say-theyve-found-a-rogue-planet-with-no-su-1443571329
http://io9.com/5960669/astronomers-may-have-just-discovered-the-first-known-free-floating-planet
http://io9.com/5877001/what-causes-rogue-planets-to-run-away-from-their-stars
http://www.britannica.com/EBchecked/topic/1267520/gravitational-microlensing
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