Mars Reconnaissance Orbiter

The Mars Reconnaissance Orbiter, or MRO, is arguably the most powerful set of eyes ever placed in orbit around another planet. Launched by NASA in August 2005 and arriving in March 2006, it carries the largest telescopic camera ever sent to Mars, capable of resolving objects on the surface as small as a desk from hundreds of kilometers up.

That extraordinary imaging power has been transformative. MRO has photographed the landing sites of past and present missions — even capturing rovers and their parachutes on the surface — and has scouted safe, scientifically rich landing zones for missions that followed. Its high-resolution camera has revealed seasonal dark streaks on slopes, layered deposits, shifting sand dunes, and fresh impact craters, documenting a Mars that is far more dynamic and active than once believed.

Beyond imaging, MRO's instruments have mapped minerals across the surface, traced the distribution of subsurface ice, and studied the structure of the atmosphere. Like Mars Odyssey, it also serves as a critical high-bandwidth communications relay, forwarding enormous volumes of data from surface rovers back to Earth. The combination of reconnaissance, science, and relay capability has made MRO one of the most valuable and versatile assets in the entire Mars exploration program.