Mysterious giant cloud over Mars volcano is back


Arsia Mons is the second largest volcano on our outer neighboring planet. The shield volcano rises almost 20 kilometers, its caldera, which was created when a magma chamber collapsed, has a diameter of 110 kilometers. In recent years, researchers have regularly observed the emergence of an unusual phenomenon there: About 20 to 30 kilometers above the volcano, an extremely long, thin cloud forms to the west over a period of more than two months, measuring up to 1,800 kilometers.

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