Opportunity landed on Mars more than 15 Earth years ago, on January 25, 2004. Originally designed for 90-day lifetimes, the rovers persisted. It roved a staggering 45.16 kilometers across the Red Planet.
One of the thickest dust storms ever seen on Mars has been spreading since early June. The Opportunity rover - 1 of 2 active rovers on Mars - has suspended science operations.
