Where Did Earth's Water Come From?

Written & Researched by Leila Battison. Check out her channel:- https://www.youtube.com/channel/UCXIk7euOGq6jkptjTzEz5kQ Script & video edited & by Pete Kelly. Check out his channel:- https://www.youtube.com/channel/UCMq-bTjlaTZhaohEracnN6w Narrated by David Kelly. Check out his channel:- https://www.youtube.com/channel/UCqoGR_EedlhKDVuWNwYWRbg Thumbnail Art by Ettore Mazza Artwork by Eduardo Valdez References:- https://lowell.edu/history/ https://lowell.edu/wp-content/uploads/2014/08/100-Years-of-Good-Seeing-Clark-Telescope.pdf https://www.census.gov/history/pdf/mars_and_its_canals.pdf https://www.nasa.gov/content/blue-marble-image-of-the-earth-from-apollo-17/ https://nssdc.gsfc.nasa.gov/planetary/mars/mariner.html https://www.usgs.gov/special-topic/water-science-school/science/how-much-water-there-earth?qt-science_center_objects=0#qt-science_center_objects https://royalsocietypublishing.org/doi/10.1098/rsta.2015.0390 https://royalsocietypublishing.org/doi/10.1098/rsta.2015.0384 https://royalsocietypublishing.org/doi/10.1098/rsta.2017.0108 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2869525/ https://web.archive.org/web/20111009044640/http://cfcc.edu/martech/courses/msc160/Readings/Drake2005.pdf https://www.space.com/17048-water-on-mars.html Image sources:- Iván Éder / CC BY-SA (http://creativecommons.org/licenses/by-sa/3.0/) By Percival Lowell - Яков Перельман - "Далёкие миры". СПб, типография Сойкина (English transliteration: Yakov Perelman - "Distant Worlds". St. Petersburg, Soykin printing house), 1914., Public Domain, https://commons.wikimedia.org/w/index.php?curid=1226256 By Mariner 4 - NASA, Public Domain, https://commons.wikimedia.org/w/index.php?curid=44326040 By Unknown author - Reconstructed from several online sources by Joe Haythornthwaite, Public Domain, https://commons.wikimedia.org/w/index.php?curid=49296 By John Evans and Howard Periman, USGS - http://ga.water.usgs.gov/edu/watercycle.html, Public Domain, https://commons.wikimedia.org/w/index.php?curid=26818355 NASA/Goddard Space Flight Center By ESA - European Space Agency & Max-Planck Institute for Solar System Research for OSIRIS Team ESA/MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA - http://www.esa.int/spaceinimages/Images/2007/02/True-colour_image_of_Mars_seen_by_OSIRIS, CC BY-SA 3.0-igo, https://commons.wikimedia.org/w/index.php?curid=56489423 By European Southern Observatory / M. Kornmesser - https://www.eso.org/public/images/eso1509a/, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=45343974 By Iván Éder - http://www.astroeder.com/digital/C17P_Holmes/20071104/17P_Holmes_20071104_eder_en.htm, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=3119504 https://en.wikipedia.org/wiki/Mariner_4#/media/File:Mariner_4_craters.gif By Frank E. Schoonover (illustration) - Here, Public Domain, https://commons.wikimedia.org/w/index.php?curid=14933609 By Henrique Alvim Corrêa - drzeus.best.vhw.net, Public Domain, https://commons.wikimedia.org/w/index.php?curid=5910407