Mars once had rivers flowing across its surface
Billions of years ago, Mars harbored flowing rivers and lakes, transforming our view of the Red Planet from a barren rock to a potentially life-friendly world.
Billions of years ago, Mars was a much wetter world, with rivers and lakes carving channels across its landscape. High-resolution images from orbiters like NASA's Mars Reconnaissance Orbiter reveal ancient river valleys and deltas, some stretching for hundreds of kilometers. This indicates liquid water was stable on the surface for long periods.
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