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Detailed explanation-1: -Credit: NASA/JPL-Caltech/ASU. Scientists using radar data from NASA’s Mars Reconnaissance Orbiter (MRO) have found a record of the most recent Martian ice age recorded in the planet’s north polar ice cap.

Detailed explanation-2: -NASA’s Mars Reconnaissance Orbiter, launched August 12, 2005, is on a search for evidence that water persisted on the surface of Mars for a long period of time.

Detailed explanation-3: -NASA’s Mars Reconnaissance Orbiter (MRO) completed 10 years in orbit around Mars. That’s not bad for a spacecraft that had a primary mission lifetime of 2 years. Among its six main scientific instruments, all of which are still working, the standout has been HiRISE, the High Resolution Imaging Science Experiment.

Detailed explanation-4: -MRO added additional, overwhelming evidence that water once flowed on Mars. Its cameras found surface features sculpted by flowing water. It detected abundant minerals formed or chemically altered by water scattered over the planet’s surface.

Detailed explanation-5: -According to Wikipedia, the MRO has an orbital period of 112 minutes: In September 2006 MRO fired its thrusters twice more to fine-tune its final, nearly circular orbit to approximately 250 to 316 km (155 to 196 mi) above the Martian surface, with a period of about 112 minutes.