A strange long cloud has returned to Mars. Scientists say that this is right on time.

A strange long cloud has formed several times at once Martian volcano Scientists dropped it and named it.

Meet Arsia Mons Elongated Cloud, or AMEC. Its long bright trail has become a familiar feature on the peak known as Arsia Mons in the southeast of the more famous Olympus Mons. Although the cloud comes and goes over the volcano, scientists say it is not formed from the volcano itself. And it’s timely: scientists associated with Europe’s Mars Express Orbiter waited for it to reappear on its annual cycle.

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