FLAGSTAFF, Arizona, Feb. 15 -- Northern Arizona University issued the following news: * * * How to study Mars ... on Earth What's the best way to get hands-on experience studying craters on Mars ... without leaving this planet? That's easy--visit the unearthly site where a meteor slammed into Earth ~50,000 years ago. Located just 45 minutes east of NAU's Flagstaff mountain campus, Meteor Crater is one of the best-preserved impact craters in the world, which makes it an ideal place to study  more PR