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First measurements of ‘interstellar comet’

Image copyright Gemini Observatory/NSF/AURA Image caption Two-colour composite image of C/2019 Q4 (Borisov) obtained using the Gemini North Multi-Object Spectrograph (GMOS) on Hawaii’s Maunakea Astronomers are gathering measurements on a presumed interstellar comet, providing clues about its chemical composition. The object, C/2019 Q4 (Borisov), is only the second interstellar object …

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