Mysterious giant cloud over Mars volcano is back

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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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