We Finally Know What’s Going on With That Weird, Long, Recurring Cloud on Mars – ScienceAlert

In 2018, a camera on board the Mars Express mission caught sight of a strangely long and wispy cloud, billowing across the surface of the red planet.
From a distance, the 1,500-kilometer (930-mile) trail of fog almost resembled a plume of smoke, and it seemed to be emerging from the top of a long-dead volcano.
Looking back at archived images, researchers soon realized this had been happening for a while. Every few years in spring or summer, this curious cloud would return, before disappearing once…

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