Mars (probably) has a lake of liquid water

A lake beneath the Red Planet’s southern ice sheets may be the best place to find life

Mars' southern polar ice sheets

WHAT LIES BENEATH  There may be a 20-kilometer-wide lake hidden under Mars’ southern polar ice sheets, shown here in images from NASA’s Mars Orbiter Camera on the Mars Global Surveyor spacecraft.

Goddard Space Flight Center Scientific Visualization Studio Mars Orbiter Camera data/NASA

A Mars orbiter has detected a wide lake of liquid water hidden below the planet’s southern ice sheets.