The Arsia Mons Elongated Cloud is a wisp of water ice that appears downwind of the 20-km- (12.4-mile) tall Arsia Mons volcano — the southernmost in a trio of giant Martian shield volcanoes known collectively as Tharsis Montes — in the Martian southern hemisphere’s spring and summer. This image from ESA’s Mars Express shows the Arsia Mons Elongated Cloud. Image credit: ESA / DLR / FU Berlin / J. Cowart. The Arsia Mons Elongated Cloud...
