How Hydrogen Kept Early Mars Warm

Mars haunts us as a vision of a planet gone wrong. It was once warm and wet, with rivers flowing across its surface and (potentially) simple life residing in its water bodies. Now it’s dry and freezing.Could Earth suffer this fate? Are there innumerable other worlds throughout the Universe that were habitable for a period of time before becoming uninhabitable?To answer those questions, we have to answer one of the big questions in space science: What drove the changes on Mars? New research