The strange long cloud of Mars is finally revealing some of its secrets

A European spacecraft is unraveling the secrets of the strange long cloud which has been appearing over and over in the Martian sky for years.

the Elongated Cloud of Arsia Mons is a peculiar feature of Mars: a long, bright cloud of water ice that extends over the Martian surface, extending over the planet’s Arsia Mons volcano to the volcano Olympus Mons, the highest mountain in the solar system. The strange phenomenon has been repeated every year around the southern solstice of Mars, and the cloud forms and fades daily for 80 days or more at a time on the red planet.

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