206. Manganese oxides were found by @marsninja using Curiosity's laser instrument, suggesting Mars' atmosphere had more oxygen in the past. http://pic.twitter.com/oDvZvnQ27y
— Tanya Harrison (@tanyaofmars) July 17, 2017
via Twitter https://twitter.com/tanyaofmars
July 18, 2017 at 01:08AM
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