Rocky surfaces on planet Mars. Space news
Rocky surfaces on planet Mars. Space news
Rocky surfaces on planet Mars. © NASA

It is estimated that almost half of Mars's northern hemisphere was once covered by a huge ocean. So, where did all the water go? A new study from Oxford University claims that basal rocks on Mars can hold up to 25% more water than similar rock from Earth, thus they may have sucked the water from the surface towards the inside of the planet.

The same thing probably happened on Earth, in its infancy. But, when Earth became super hot the water-filled rocks melted releasing the water back, a phenomenon that did not occur on Mars. This suggests that the lost water of Mars is, at least in part, trapped in rocks now located deep inside the mantle of the planet.

Source: http://www.marsdaily.com/reports/Thirsty_rocks_may_contain_the_missing_water_of_Mars_999.html

Scientific publication : https://www.nature.com/articles/nature25031