Liquid Water 1.5 km under Mars surface detected via Radio Echo Radar
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Feb 7, 2022European Space Agency and NASA found Liquid Water deposits under South Pole of Mars using MARSIS Radar instrument. Science article presents strong radar echoes from the bottom of the Martian southern polar deposits are interpreted as being due to the presence of liquid water under 1.5 km of ice. Finally it is possible, that under huge layer of ice there could probably be lakes and flowing Martian rivers. Radio Echo Sounding (RES) is a suitable technique to resolve this dispute, because low frequency radars have been used extensively and successfully to detect liquid water at the bottom of terrestrial polar ice sheets. Sound/acoustic radar means that frequency of transmitted signal is quite low. The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument on the Mars Express spacecraft is used to perform RES experiments at Mars.
Credit: esa.int, nasa.gov, ESA/NASA/JPL/Univ. Rome; R. Orosei et al 2018
Source science article: www.science.org/doi/10.1126/s…
Source for ESA’s image of Mars crater: esa.int/ESA_Multimedia/Images/2018/12/Plan_view_of_Korolev_crater
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← This sequence is cropped (and looped) from the last 10 frames of the video captured on Sol 6 by a camera on the lander for NASA’s Mars Pathfinder rover. Not enough pixels, but still, mighty impressive. This evidence was discovered -way- back in the day by 
