Commentary: Mars probe Opportunity had so much to teach us

The Mars Exploration Rover Opportunity mission officially ended last week, as we accepted the reality that Oppy had gone silent forever.Engineered to last only three months, Oppy persevered for nearly 15 years and traveled over 28 miles, working longer and traveling farther on an extraterrestial surface than any other lander.Oppy’s last transmission, translated into plain-speak, is almost heartbreaking, if we allow ourselves the indulgence that rovers, like humans, can feel: “My batt