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Updates on an alien visitor: The interstellar comet 2I/Borisov

30 Sep 2019, 13:00 UTC
Updates on an alien visitor: The interstellar comet 2I/Borisov Gemini Observatory/NSF/AURA

As I wrote on the blog a couple of weeks ago, our solar system is welcoming its second known interstellar visitor: A comet from another star. We know it's interstellar because it's screaming into the solar system at tremendous speed, far too high a velocity for the Sun to hold onto it. It must have come from another star.

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