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Sources:
http://nature.com/articles/doi:10.1038/s41561-017-0012-5
https://www.space.com/36162-mars-dark-streaks-dry-avalanches.html
https://www.nasa.gov/mission_pages/phoenix/news/phoenix-20080731.html
http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo2917.html
https://www.nasa.gov/feature/jpl/mars-gullies-likely-not-formed-by-liquid-water
http://onlinelibrary.wiley.com/doi/10.1002/2016GL068956/full
https://www.nature.com/articles/ngeo2546
https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/201731973
https://www.eso.org/public/archives/releases/sciencepapers/eso1736/eso1736a.pdf
https://www.eurekalert.org/pub_releases/2017-11/e-ctw111317.php
https://www.eso.org/public/teles-instr/lasilla/36/harps/
Images:
https://www.nasa.gov/press-release/nasa-confirms-evidence-that-liquid-water-flows-on-today-s-mars
https://commons.wikimedia.org/wiki/File:South_Polar_Cap_of_Mars_during_Martian_South_summer_2000.jpg
https://commons.wikimedia.org/wiki/File:Warm_Season_Flows_on_Slope_in_Newton_Crater_(animated).gif
https://commons.wikimedia.org/wiki/File:Hirise_at_mars.jpg
https://commons.wikimedia.org/wiki/File:Slope_Lineae_PIA14479-43_946-710.jpg
https://www.nasa.gov/feature/jpl/mars-gullies-likely-not-formed-by-liquid-water
http://www.eso.org/public/usa/images/eso1736a/
https://commons.wikimedia.org/wiki/File:Spektrograf_HARPS.jpg
https://commons.wikimedia.org/wiki/File:RedDwarfNASA.jpg
https://commons.wikimedia.org/wiki/File:ELT_concept.jpg