By now, you've probably gathered that the orbiter isn't looking for some stray puddles or some body of water that scientists missed on previous surveys of the planet. Instead, the orbiter's cameras and spectrometers are searching for mineral deposits left by water. A sounder uses radar to find underground liquid reserves. Other cameras monitor clouds and dust storms. All the information from the Mars Reconnaissance Orbiter is relayed back to Earth through X-band and Ka-band radio waves that are picked up by the Deep Space Network antenna in Canberra, Australia. In the past, orbiting spacecraft have observed two groups of hydrated minerals on Mars: phyllosilicates, which formed 3.5 billion years ago when Martian water encountered rock, and hydrated sulfates, which formed 3 billion years ago due to evaporation. In 2008, however, the Mars Reconnaissance Orbiter discovered new hydrated minerals on the red planet in the form of hydrated silica, also known as opal. These newly discovered minerals formed when water was exposed to areas affected by meteorites or volcanic activity.
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