Adding to the Fleet

Mars Reconnaissance Orbiter fires its engine to enter orbit around Mars in this artist's concept. The firing took place on March 10. MRO will spend the next several months refining its orbit by dipping lower into the Martian atmosphere on each pass, and will reach its final science orbit in the fall. Three other working spacecraft are already in Mars orbit, while two rovers continue to study the planet from the surface. [Credit: NASA]