'Oceans' of water may hide on Mars

 作者:甘嵘樯     |      日期:2018-01-15 03:02:28
WHAT if Mars hasn’t lost its water and atmosphere, but is just hiding them beneath the surface? Dried-up riverbeds and sedimentary rocks suggest that the planet once had enough liquid water to fill a global ocean more than 600 metres deep. It would also have had an atmosphere rich in CO2 to keep the planet warm and the water liquid. Mars is thought to have lost much of its atmosphere, and consequently its water, to space due to solar wind skimming off molecules. In 1989,