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Sources:
https://phys.org/news/2015-11-tidal.html
https://phys.org/news/2017-08-tidally-exoplanets-common-previously-thought.html
http://www.astro.sunysb.edu/fwalter/AST101/habzone.html
https://arxiv.org/pdf/1405.1025.pdf
https://habitability.univie.ac.at/fileadmin/user_upload/k_habconf2016/pdf/talks/Carone.pdf
https://www.scientificamerican.com/article/the-color-of-plants-on-other-worlds/
https://phys.org/news/2012-05-group-circadian-clock-common-life.html
https://scienceblogs.com/clock/2009/05/28/yes-archaea-also-have-circadia
http://www.trappist.one/
https://arxiv.org/abs/1708.02981
https://exoplanets.nasa.gov/news/1448/trappist-1-is-older-than-our-solar-system/
https://www.space.com/6560-life-thrive-red-dwarf-star.html
http://nautil.us/blog/-forget-earth_likewell-first-find-aliens-on-eyeball-planets
Images:
https://svs.gsfc.nasa.gov/20248
https://svs.gsfc.nasa.gov/12850
https://en.wikipedia.org/wiki/File:TRAPPIST-1f_Artist%27s_Impression.png
https://svs.gsfc.nasa.gov/12319
https://svs.gsfc.nasa.gov/12425
https://svs.gsfc.nasa.gov/11747
https://svs.gsfc.nasa.gov/11531
https://en.wikipedia.org/wiki/File:Gliese_581_-_2010.jpg
https://www.nasa.gov/image-feature/jpl/pia21473/flaring-red-dwarf-star
https://www.eso.org/public/videos/barnard-surface2b-v2-cc1/
https://www.eso.org/public/images/eso0950a/
https://en.wikipedia.org/wiki/File:PIA21429_-_Transit_Illustration_of_TRAPPIST-1_(cropped).jpg