New radar scans taken by the European Space Agency's Mars Express orbiter have detected what astronomers think is a substantial stretch of water flowing beneath surface layers, and it's renewing hope that any lifeforms that may have once been present on the planet's surface may still be there in the pocket of liquid. It's also a promising sign that suggests there is even more water to be found elsewhere underground.
The discovery is a long time coming, as the orbiter has been flying around and around Mars since 2003, scanning various areas to investigate the planer's interior structure and composition. The orbiter has been taking repeated and specific scans of the area in question for quite some time after detecting multiple layers beneath the surface, and scientists finally have enough evidence to say it's a patch of liquid. It's not yet clear what exactly the liquid is, but experts are all but certain its salty water, since billions of years ago, the planet was dotted with seas.
“This subsurface anomaly on Mars has radar properties matching water or water-rich sediments,” said Roberto Orosei, principal investigator for the experiment and lead author of the just-published paper that outlined the findings in Science, in a press release. “This is just one small study area; it is an exciting prospect to think there could be more of these underground pockets of water elsewhere, yet to be discovered.”