Lake detected beneath the surface of mars
According to a new study by Italian researchers from the Italian Space Agency, A lake of liquid water has been detected by radar beneath the southern polar ice cap of Mars.
Between May 2012 and December 2015, Mars Advanced Radar for Subsurface and Ionosphere Sounding instrument, (MARSIS)
was used to survey the Planum Australe region, which is in the southern ice cap of Mars. It sent radar pulses through the surface and polar ice caps and measured how the radio waves reflected back to Mars Express.
Those pulses reflected 29 sets of radar samples that created a map of drastic change in signal almost a mile below the surface. It stretched about 12.5 miles across and looked very similar to lakes that are found beneath Greenland and Antarctic ice sheets on Earth. The radar reflected the feature's brightness, signaling that it's water.
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