For more than two years, NASA’s Perseverance rover has been roaming Mars, drilling for rock samples that may hold clues to ancient life on the Red Planet, but the six-wheeled robot can only travel so far. Luckily, the rover recently got some extra help from a river that once flowed on the surface of Mars.
https://gizmodo.com/nasa-rovers-newest-rock-sample-is-a-gift-from-an-ancien-1850659345