Curiosity, the new NASA rover that’s been exploring Mars, has been consumed with drilling through rock and studying what can be known about the planet from the ground. But new photos show that some of Curiosity’s greatest finds may come from the sky above Mars.

Curiosity recently discovered clouds passing by the Red Planet, being blown overhead by high winds. Cloud cover, as you know, contains water droplets or ice water crystals, which is why clouds appear before a rainstorm, snowstorm, or tropical storm. Water is a necessary ingredient to create and sustain life, and the presence of clouds alongside of pooling water traces discovered on Mars point to the possibility that life could’ve once existed on the planet.

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