We may never figure out where interstellar comet 3I/ATLAS came from

A deep image of 3I/ATLAS captured by the International Gemini Observatory in Chile, showing the coma of gas and dust around the comet International Gemini Observatory/NOIRLab/NSF/​AURA/Shadow the Scientist 3I/ATLAS, the interstellar comet passing through our solar system, might have been radically transformed by cosmic rays over billions of years, changing its appearance so thoroughly that…

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What causes the rainbow shimmer of ammolite gems?

The jewels nabbed in the Louvre heist may still be at large, but scientists have just closed the case on another gemstone mystery: what gives rare ammolite gems their rainbow shimmer. Ammolite comes from the fossilized shells of extinct squidlike critters called ammonites. Scientists knew the secret to the fossils’ flamboyant appearance lay somewhere in…

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