Scientists have found seismic clues that suggest liquid water may be hiding beneath Mars' surface.
By listening to the echoes of "marsquakes" — seismic waves rippling through Mars' crust — researchers uncovered signs of water lingering at the base of the planet's upper crust, which sits between 3.4 and 5 miles (5.4 and 8 kilometers) below the surface.
"Within our solar system, Mars has consistently been at the forefront of the search for extraterrestrial life," said Weijia Sun, a professor at the Institute of Geology and Geophysics, Chinese Academy of Sciences and one of the study's authors, to Space. "The presence of liquid water is regarded as one of the most critical factors in this endeavor."
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