In 2018 researchers claimed evidence of a lake beneath the surface of Mars, detected by the Mars Advanced Radar for Subsurface and Ionosphere Sounding instrument (or Marsis for short).
But new Mars observations “are not consistent with the presence of liquid water in this location and an alternative explanation, such as very smooth basal materials, is needed.” Phys.org explains
Aboard the Mars Reconnaissance Orbiter, the Shallow Radar (SHARAD) uses higher frequencies…

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