The Secret behind the Strange Clouds on Mars

Every spring on the red planet, the familiar 1200-mile wide cloud appears on the volcano Arsia Mons. Astronomers wonder if it’s an eruption. With the ESA "Mars Express" probe, they revealed the secret some time ago. Subscribe for more! ► https://bit.ly/2Q64mGd Credit: NASA, ESA, ESO, SpaceX, Wikipedia, Shutterstock, ... #TheSimplySpaceEN

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