Mars Liquid Water Evidence
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Mars could have an ocean's worth of water beneath its surface, seismic data suggest

73% Informative
New analysis of seismic data from NASA 's InSight lander shows evidence of liquid water on Mars .
Seismometers detected seismic waves from Mars ' subsurface.
Seisms show there is liquid water in porous rock, filling cracks and hollows between 6 and 12 miles ( 10 and 20 kilometers ) deep.
The existence of so much liquid water could suggest the possibility of "the presence of microbial activity".
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