NASA’s Mars Curiosity rover has traveled over 21.33 miles since it first landed on the Red Planet in 2012. That might not seem like very far, but it’s an impressive trek considering the vehicle only averages about 98 feet per hour and mission engineers must remotely steer it from over 140 million miles away.

Curiosity rover is hunting for microbial life on Mars. NASA reconnaissance orbiter snapped its first-ever image of Curiosity moving across the planet.

A rock containing many smaller round stones could indicate that there was once a large amount of liquid water on the Red Planet.