... Greeley Panorama on Mars . ... Credit Copyright: NASA / JPL-Caltech / Cornell / Arizona State U. Explanation: What did you do over your winter vacation? If you were the Opportunity rover on Mars, you spent four months of it stationary and perched on the northern slope of Greeley Haven -- and tilted so that your solar panels could absorb as much sunlight as possible. ... Publications with keywords: Opportunity rover - Mars . Publications with words: Opportunity rover - Mars . ...