The Jet Propulsion Laboratory’s greatest minds expected its two identical Mars Exploration Rovers to last 90 days before dust clouded their solar arrays and drained their power. On Sunday, one of those NASA rovers, Opportunity, rolled into its 12th anniversary on Mars. It’s now a veteran of surviving the harsh Martian landscape that most believed would limit its lifespan to months, not years. Opportunity’s sibling, Spirit, landed weeks...
