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The Comet 2I/Borisov, From Another Solar System, Analyzed By Atacama Large Millimeter/Submil Limeter Array Of Telescopes (ALMA) In Chile, Has Similar Amounts Of Hydrogen Cyanide Like Our Average Comet, But Btw 9 To 26 Times Higher Carbon Monoxide Than Ours, Indicating It Formed At Lowest Space Temperatures, < -250 °C.

Scientists get first look inside comet from outside our solar system – CNN

https://www.cnn.com/2020/04/20/world/interstellar-comet-2iborisov-new-details-scn/index.html

Since it was first observed in 2019, interstellar comet 2I/Borisov has been streaming across our solar system and the heat of our sun has caused it to shed gas — and information about where it came from.