13. Borisov/Comet 2I
Found Year: 2018.
It was discovered by Sergey Borisov.
Location: N/A
2I/Borisov is the second interstellar invader after ϻOumuamua and the first known rogue comet. Gennadiy Borisov, a Crimean amateur astronomer and telescope manufacturer, made the discovery of the comet in August 2019. The rogue comet, which is not connected to the Sun, travelled through the Solar System’s ecliptic in October 2019.
Comet 2I/Borisov ©NASA, D. Jewitt/Wikimedia, and ESA
The comet’s tail was discovered to be 14 times larger than Earth in November 2019, according to Yale University scientists, who also observed that “it is humbling to realise how small Earth is next to this visitor from another solar system.”
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