Scientists add that the beaches on Mars appear to have shifted position over time as data reveals several features dipping towards the north which Cardenas says is an indication t

Scientists have discovered that Mars once had beaches. While the past presence of water on the Red Planet is no longer in doubt, experts have now found layers of rock beneath Mars' surface, suggesting the likely existence of an ancient ocean.

The Chinese rover spent a year bumping around Mars, using ground-penetrating radar to figure out what's going on below the Red Planet's current day surface.