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wetter MarsGizmodo
•79% Informative
NASA 's Perseverance rover has found green spots on a red rock on Mars .
The red rock contains blobs of green blobs, hinting at how it formed on an ancient, wetter planet.
The green spots occur when water permeates the iron-rich sediment before it turns into rock, oxidizing the metal and turning it green.
The rock's redness is likely due to oxidized iron, but the rover wanted to take a closer look.
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