NASA has announced the end of the Opportunity rover’s mission. Opportunity rolled out on to the Martian surface in 2004, 20 days after its twin, Spirit, had landed on the other side of the Red Planet.
Discoveries:
- Mars was likely wetter and warmer in the past.
- Opportunity was the first rover to identify and characterise sedimentary rocks on a planet other than Earth.
- Opportunity found white veins of gypsum, a telltale sign of water that travelled through underground fractures.
- It also discovered clay minerals that formed in neutral-pH water.
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