gennadiy borisov
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Our Second Interstellar Visitor Was a ‘Dirty Snowball’ With Stories to Tell
New research suggests Borisov — the second known interstellar visitor to our solar system — had never previously visited a star, not even the one from its home system, prior to zipping past our Sun in 2019. That makes Borisov one of the most pristine — if not the most pristine — comet ever observed…