Nineteen mysterious invaders from another Solar System spotted hanging around the outside edge of ours

Astronomers have discovered a new population of foreign asteroids that have been quietly orbiting the Sun on the outskirts of our Solar System. These 19 space rocks have been right under our noses the entire time, almost since the Solar System formed some 4.5 billion years ago. But they were hidden amongst all the other objects part of a group known as the Centaurs, according to a research paper published in the Monthly Notices of the Royal Astronomical Society on Thursday.

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