On January 24, 2004, the Opportunity rover sent back its first signal from the Red Planet. That marked the start of a 90-day planned mission for the six-wheeled, golf cart-sized rover. Fifteen years later, the rover’s mission has finally ended, NASA announced today.

Its longevity and discoveries are a testament to Opportunity’s design and construction. The rover ultimately sent back more than 200,000 raw images and traveled a total of 28 miles (45 kilometers), farther than a standard mara