NASA's Mars Orbiter Spies Victoria Crater

An image of the Victoria Crater, one of the biggest craters on Mars, was released on Friday.
Scientists located several layers of sedimentary rock and think it could be a sign that there was once liquid water on the Red Planed.

Victoria Crater is 200 meters deep and has a diameter of 800 meters, which means it is 5 times larger than other craters observed so far. Scientists from NASA emphasized the images of the crater are a touchstone for exploration studies of Mars, and will contribute to answering questions about Mars? past .

NASA?s Mars Rover Opportunity was sent to Mars in 2004. Opportunity reached the Victoria Crater, which was its biggest target so far, on Sept., 27, 2006. After a long preparation process, Opportunity finally managed to take pictures of Victoria Crater on its 951st day on the planet.