A new study indicates that Mars’ mantle contains as much water deep underground as Earth’s
Despite claims in the 1890s that Mars with filled with canals teeming with water, research over the past several decades has suggest that in fact, Mars has only a tiny amount of water, mostly near its surface.Then, during the 1970s, as part of NASA’s Mariner space orbiter program, dry river beds and canyons on Mars were discovered—the first indications that surface water may have once existed there. The Viking program subsequently found enormous river valleys on the planet, and in 2003 it was announced that the Mars Odyssey spacecraft had actually detected minute quantities of liquid water on and just below the surface, which was later confirmed by the Phoenix lander.
Now, according to an article published yesterday in the journal Geology, there is evidence that Mars is home to vast reservoirs of water in its interior as well. The finding has weighty implications for our understanding of the geology of Mars, for hopes that the planet may have at some point in the past was home to extraterrestrial life, and for the long-term prospects of human colonization there.