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Why Mars Rovers Don't Study Water

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Rovers like Curiosity search for life on Mars using rock and soil samples, but why don't they examine liquid or frozen water?

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Sources:

https://nodis3.gsfc.nasa.gov/displayDir.cfm?Internal_ID=N_PD_8020_007G_&page_name=main&search_term=contamination
https://www.nap.edu/read/11381/chapter/3
https://planetaryprotection.nasa.gov/about-categories/
https://www.cbtnuggets.com/blog/2016/10/bytes-and-bacteria-exposing-the-germs-on-your-technology/
https://marsnext.jpl.nasa.gov/scieng_plantary.cfm
http://w.astro.berkeley.edu/~kalas/ethics/documents/environment/COSPAR%20Planetary%20Protection%20Policy.pdf
https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20130010386.pdf
https://planetaryprotection.nasa.gov/file_download/47/VikingMicrobiologicalAssayPlan.pdf

Images:

https://en.wikipedia.org/wiki/File:Martian_north_polar_cap.jpg
https://en.wikipedia.org/wiki/File:Viking_Oven.jpg
https://en.wikipedia.org/wiki/File:PIA19808-MarsCuriosityRover-AeolisMons-BuckskinRock-20150805.jpg
https://commons.wikimedia.org/wiki/File:MarsCuriosityRover-Drilling-01.jpg
https://en.wikipedia.org/wiki/File:PIA15279_3rovers-stand_D2011_1215_D521.jpg
https://en.wikipedia.org/wiki/File:Viking_Lander_Model.jpg
https://en.wikipedia.org/wiki/File:PIA21635-Mars2020Rover-ArtistConcept-20170523.jpg
https://en.wikipedia.org/wiki/File:InSight_Lander_Transparent.png

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