Astronomers thought comet Borisov was pretty boring. They were wrong.

Astronomers thought comet Borisov was pretty boring. They were wrong.
Our solar system is full of comets that whizz by as we track them over centuries. But humans have so far seen only two visiting objects from outside the solar system. There’s ‘Oumuamua, the interstellar asteroid that we think might actually be a flat pancake-like rock originating from the remains of an exoplanet similar to Pluto. It’s…
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