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Sources:
http://www.planetary.org/explore/space-topics/exoplanets/how-to-search-for-exoplanets.html
https://exoplanets.nasa.gov/interactable/11/
https://exoplanetarchive.ipac.caltech.edu/docs/counts_detail.html
https://www.nasa.gov/press-release/nasa-telescope-reveals-largest-batch-of-earth-size-habitable-zone-planets-around
http://www.space.com/30240-alien-planets-exoplanet-search-methods-infographic.html
http://curious.astro.cornell.edu/about-us/77-the-universe/extrasolar-planets/general-questions/323-how-are-planets-detected-around-other-stars-intermediate
https://exoplanets.nasa.gov/the-search-for-life/exoplanets-101/
http://www.space.com/24894-exoplanets-habitable-zone-red-dwarfs.html
http://home.strw.leidenuniv.nl/~keller/Teaching/ADA_2011/ADA_2011_L06_Exoplanets.pdf
https://arxiv.org/abs/1508.01338
http://iopscience.iop.org/article/10.1086/506930/pdf
Images:
https://commons.wikimedia.org/wiki/File:PIA21429_-_Transit_Illustration_of_TRAPPIST-1_(cropped).jpg
https://commons.wikimedia.org/wiki/File:ESO_-_The_Radial_Velocity_Method_(by).jpg
https://commons.wikimedia.org/wiki/File:HD189733b.jpg