NASA's Mars Exploration Rover Opportunity is spent the seventh anniversary of its landing on Mars investigating a crater called "Santa Maria," which has a diameter about the length of a football field. This scene looks eastward across the crater. Portions of the rim of a much larger crater, Endurance, appear on the horizon.

Opportunity landed in the Meridiani Planum region of Mars on Jan. 24, 2004, Universal Time (Jan. 25, Pacific Time)