Have you ever dreamt about visiting Mars? But then again, how would you survive there without water. If you've been imagining it as an extremely dry place, you might need to change your opinion! Scientists think there could have been a lot of water on Mars in the past. They've found loads of ancient river valley networks and lake beds on the surface of the Red Planet. Plus, on Mars, there are minerals and rocks that could have only formed in liquid water.

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