Researchers have found evidence of an existing body of liquid water on Mars.
What they believe to be a lake sits under the planet’s south polar ice cap, and is about 20km across. They have not been able to determine how thick the layer of water might be, but the research team estimated that it was a minimum of one metre.
Lake beds like those explored by Nasa’s Curiosity rover show water was present on the surface of Mars in the past.
However, the planet’s climate has since cooled due to its thin atmosphere, leaving most of its water locked up in ice.