Comet from another star has a composition unlike anything else in our solar system

Astronomers have revealed new details about the makeup and age of a visiting comet that was born around a distant star. They ...
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Comet from outside our solar system has chemistry unlike anything we've ever seen before

(International Gemini Observatory/NOIRLab/NSF/AURA/Shadow the Scientist; Image Processing: J. Miller & M. Rodriguez ...