These are little soil spherules nicknamed “blueberries” because of their shape and color. These concretions formed in the presence of water and are made of hematite mineral. They were discovered by the Opportunity rover on Mars in 2004 and provide evidence of a watery ancient Mars. via /r/spaceporn https://ift.tt/2LJF3an
via Tumblr https://ift.tt/2UQegxo
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