Ice sheet larger than UK lies beneath Mars' surface: Study
Using ground-penetrating radar soundings from NASA's Mars Reconnaissance Orbiter spacecraft, scientists have discovered an ice sheet larger than the UK hidden beneath the planet's Utopia Planitia basin. Estimated at up to 170 metres thick and 50% pure, the ice sheet is believed to have resulted from a Martian ice age, buried before it could melt or evaporate into space.