Scientists say images of Martian craters taken by European and American space probes show there likely once was a planet-wide system of underground lakes.
This undated photo provided by the European Space Agency, ESA, shows the surface of the Mars.
Data collected by NASA and ESA probes orbiting the red planet provide the first geological evidence for an ancient Martian groundwater system, according to a study by researchers in Italy and the Netherlands published in the Journal of Geophysical Research. The notion of water on Mars has long fascinated scientists because of the possibility that the planet may have once harbored similar conditions to those that allowed life to develop on Earth. Patches of ice previously spotted on Mars provide tantalizing hints of a watery past for the arid world.
Co-author Gian Gabriele Ori said an ocean some scientists speculate Mars may once have had between three and four billion years ago could even have been connected to the underground lakes.
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