Olympus Mons is a large shield volcano on the planet Mars. By one measure, it has a height of nearly 14 miles. Olympus Mons stands almost three times as tall as Mount Everest's height above sea level. It is the youngest of the large volcanoes on Mars, having formed during Mars's Amazonian Period. A false-color image is an image that depicts an object in colors that differ from those a photograph Viking 1 was the first of two spacecraft (along with Viking 2) sent to Mars as part of NASA's Viking program. It was the first spacecraft to successfully land on Mars and perform its mission, and held the record for the longest Mars surface mission of 2307 days or 2245 sols (from landing until surface mission termination, Earth time) until that record was broken by the Opportunity Rover on May 19, 2010.