* Astronomy

ExoMars: Rover scientists to study Mawrth Vallis option

Europe is going to investigate a second site on Mars as a possible destination to send its 2021 rover.
Scientists spent two days considering the options and plumped in the end for Mawrth Vallis - an area rich in clay minerals that must have formed during prolonged rock interactions with water.
Mawrth joins Oxia Planum, which was selected for study in 2015.
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