Massive Cloud Forming Over One of Mars' Biggest Volcanoes Is Icy Water Vapor, Not Eruption

This week, the European Space Agency released a curious photo captured by the Mars Express orbiter of a 930-mile-long cloud formation spilling out of the massive, 12-mile-high Arsia Mons volcano on Mars--a phenomenon that has been observed for weeks straight. It certainly gave every superficial appearance that the...