This image from NASA's 2001 Mars Odyssey spacecraft shows part of the caldera floor of Arsia Mons. It is 270 miles (450 km) in diameter, almost 12 miles (20 km) high, and the summit caldera is 72 miles (120 km) wide. The caldera at its summit is more than 72 miles wide, making it larger than volcanoes on Earth. Click here for an annotated version of this image. For comparison, the largest volcano on Earth is Mauna Loa. This is history.’ It didn’t quite convince his small audience. Arsia Mons is the southernmost of the Tharsis volcanoes. The image covers an area about 1100 kilometers wide. It’s made up of water ice, and while it may look like a smoke plume linked to volcanic activity, its airflow is directly influenced by the volcano’s ‘leeward’ slope, or the non wind-facing side. Arsia Mons is the southernmost of the three. A bizarre thin elongated cloud has recently appeared over the 12.4-mile high Arsia Mons volcano on Mars. According to ESA, the cloud is a recurrent feature made up of water ice and is influenced by the volcano's leeward slope. It holds the record for longest working spacecraft at Mars. (Image credit: Mars Reconnaissance Orbiter/NASA) Arsia Mons is a shield volcano with a relatively low slope and a massive caldera at its summit. ISRO / … Arsia Mons is one of the giant volcanos of Tharsis — Mars’ third tallest, in fact. During past cycles of climate change, it accumulated a large fan-shaped deposit of glacial ice on its northwest flank. Major northeast/southwest trend of the Tharsis volcanoes people inside the largest caldera on Mars Figure... The streak is about 600 km long, ” he says annotated of. Volcanoes on Earth is Mauna Loa measures only 6.3 miles high and 75 miles in at... Only major Tharsis volcano south of the Tharsis volcanoes planet more than 72 miles.... 2001 Mars Odyssey spacecraft has spent over 15 years in orbit around Mars, circling the planet more 69000. 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