10 Years On Mars: What Spirit & Opportunity Discovered
NASA's twin rovers have spent a decade on the red planet, using their scientific instruments and engineering cameras to explore rocks and soil.
3 of 11
Largest meteorite Opportunity discovered a watermelon-sized rock, which NASA called "Block Island," the largest meteorite found yet on Mars. Scientists were able to learn that the rock is rich in iron and nickel. It's similar to some meteorites found on Earth. Opportunity used its panoramic camera to take images of the meteorite, providing scientists with an approximately true-color composite of what it actually encountered on the Red Planet. (Source: NASA)