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Travelling at around 110,000mph, the interloper will pass roughly 190million miles from Earth in December, according to Nasa.
That's about twice the average distance from Earth to the Sun.
Borisov's breakneck speed indicates it came from interstellar space, and will likely return there again sometime next year.
Unlike Oumuamua, which was only spotted as it sped past Earth, scientists saw Borisov coming weeks before its visit.
Mysterious interstellar object pictured coming towards us from deep space – and will make '''close approach''' next month
Water and other "earthly" substances have already been identified in the tail. Too bad we can't send a ship up to it.
Water Detected in Interstellar Comet 2I/Borisov | Astronomy | Sci-News.com
The astronomers analyzed spectra of 2I/Borisov obtained by the ARCES instrument, a high spectral resolution spectrograph mounted on the 3.5-m Astrophysical Research Consortium Telescope at Apache Point Observatory.
They detected the presence of water via the [O I] 6300 Å line emission.
“We determined an H2O production rate of 6.3*1026 mol/s,” the researchers explained, “which when compared to cyanide (CN) gas measurements suggest Borisov is either enhanced or typical in CN compared to the average value for Solar System comets, though the enhanced numbers are still within the range of observed values.”
“Diatomic carbon (C2), while likely depleted compared to CN, is either typical or depleted when compared to H2O.”