Astronomers find cosmic 'fossil' with unusual orbit beyond Pluto
Astronomers have discovered a cosmic "fossil" at the edge of our solar system, beyond the orbit of Pluto. Nicknamed 'Ammonite', the object implies something happened at edge of our solar system around 400 million years after its birth. It further lowers likelihood of 'Planet Nine' hypothesis, and increases possibility of a planet existing in solar system, but later being ejected.