Ninety days. That’s all anyone expected to get out of Spirit and Opportunity, the twin rovers that first touched down on Mars in January of 2004. And yet, we are only just now saying goodbye to Opportunity, who lived for 90 days and then 5,262 more. The longevity of the Mars Exploration Rover project is a testament to the ingenuity, hard work and vision of the scientists, engineers, researchers and more who devoted themselves to expanding humanity’s knowledge of the universe. The rovers are also a crowning achievement for Cornell: The project’s principal investigator is Prof. Steven Squyres ’78 Ph.D. ’81, the James A. Weeks Professor of physical sciences.