Why Was Mars's Underground Lake So Hard to Find? | Breaking News!

Researchers have discovered an underground, liquid water lake on Mars! What might it be like, and why did it take us so long to find it?
Our SciShow episode about this:https://www.youtube.com/watch?v=vJkYBhSqet8&feature=youtu.be

Host: Caitlin Hofmeister

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Sources:

Paper: http://science.sciencemag.org/cgi/doi/10.1126/science.aar7268

http://science.sciencemag.org/cgi/doi/10.1126/science.aau1829
https://www.nap.edu/read/11381/chapter/3
https://planetaryprotection.nasa.gov/about-categories/
https://marsnext.jpl.nasa.gov/scieng_plantary.cfm
https://mars.nasa.gov/programmissions/missions/past/viking/
https://www.hou.usra.edu/meetings/lpsc2015/pdf/2586.pdf
https://www.esa.int/Our_Activities/Space_Science/Mars_Express
http://science.sciencemag.org/content/316/5821/92
https://news.umich.edu/martian-salts-must-touch-ice-to-make-liquid-water-study-shows/
http://www.esa.int/Our_Activities/Space_Science/Mars_Express/Mars_Express_radar_gauges_water_quantity_around_Mars_south_pole
https://em.geosci.xyz/content/physical_properties/dielectric_permittivity/index.html
https://planetaryprotection.nasa.gov/marsrequirements

Images:

https://commons.wikimedia.org/wiki/File:Flathead_River,_Flathead_Lake.jpg
https://svs.gsfc.nasa.gov/11796
https://jpl.jpl.nasa.gov/spaceimages/details.php?id=PIA19917
https://svs.gsfc.nasa.gov/3896
https://commons.wikimedia.org/wiki/File:Mars_Express_over_Tharsis_volcanoes.jpg
https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA02393
https://svs.gsfc.nasa.gov/4249
https://commons.wikimedia.org/wiki/File:Perchlorate-2D-dimensions.png
https://commons.wikimedia.org/wiki/File:Perchlorate-3D-balls.png
https://www.nasa.gov/mission_pages/mars/images/pia09226.html
https://www.nasa.gov/mission_pages/mars/images/pia09222.html
https://commons.wikimedia.org/wiki/File:NASA_spacecraft_comparison2.png
https://commons.wikimedia.org/wiki/File:%22Tatort%22_Blood_Falls_(16293969810).jpg
https://en.wikipedia.org/wiki/File:Blood_falls1_f_Low_Res_nsf.gov.jpg
https://www.nasa.gov/multimedia/imagegallery/image_feature_2465.html