It's been hanging out in the orbit of Jupiter for a very long time, but 2015 BZ209 has a small problem:
It's going the wrong way. And science declares that that means it didn't form with the rest of the solar system.
In other words, it came from somewhere else. And unlike our flyby visitor 'Oumuamua, it's sticking around in a stable configuration. We might even be able to go take a look one day.
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