Interstellar comet Borisov has an unexpected amount of carbon monoxide

Second visitor from the stars has three times the CO relative to H2O than any local comets

comet 2I/Borisov

A wispy tail of gas and dust trails behind interstellar comet 2I/Borisov, seen about 420 million kilometers from Earth in this Hubble Space Telescope picture from October 12, 2019.

D. Jewitt/UCLA, ESA, NASA

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