NASA probe finds opals in Martian crevices: "
Mars became Australian uninhabitable later than thought
A NASA space probe orbiting Mars has discovered deposits of opals in the mighty Valles Marineris canyon system* east of Tharsis. Opals aren't valuable enough to justify interplanetary trade, but the discovery is significant as it suggests that liquid water existed on Mars a billion years more recently than had been thought.…
"(Via The Register.)
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