A weird long cloud on Mars has returned. It’s right on schedule, scientists say.

A weird long cloud has formed so many times over the same Martian volcano that scientists have given up and named it.

Meet the Arsia Mons Elongated Cloud, or AMEC. Its long bright trail has become a familiar feature over the peak known as Arsia Mons, to the southeast of the more famous Olympus Mons. Although the cloud comes and goes over the volcano, scientists say it isn’t formed by the volcano itself. And it is timely: Scientists affiliated with Europe’s Mars Express orbiter were waiting for it to show up again on its yearly cycle.

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