Launched in 2005, the Mars Reconnaissance Orbiter continues to study the Red Planet from orbit with the highest-resolution camera ever sent to another planet, providing detailed imagery of the surface while searching for evidence of past water activity and potential landing sites for future missions.

A space probe launched in 2005 that successfully collided its impactor with comet Tempel 1 at 23,000 mph, creating a crater and revealing the comet's internal composition while the main spacecraft observed and analyzed the impact debris.

A long-duration orbiter launched in 2003 that has spent over 19 years studying Mars's atmosphere, surface, and moons while also serving as a vital communications relay for surface missions.