What might Garnets and Mars have in common?

It’s more than their shared red color.

“Microscopic tunnels in garnet crystals from Thailand appear to have been created by microorganisms boring into the rock, scientists say” – making this a possibility on Mars as well.

” “In 2020,” he says, “NASA, ESA, and the Chinese space organisation will send three separate missions to Mars to look for signs of life, including trace fossils. A few years back, tunnels like this would have been dismissed as abiotic, but today we know better.” ”

https://cosmosmagazine.com/geoscience/tiny-tunnels-in-gemstones-found-to-be-caused-by-microbes

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