Researchers found a remarkable correlation between the meteorite’s source and the predicted position of Planet Nine. These results are consistent with the “messenger hypothesis”, according to which ...

The Planet Nine theory was based on several trans-Neptunian objects, those that are beyond the eighth planet, with highly “tilted” orbits compared to the ecliptic plane. This seemed odd and ...

Does our Solar System have 9 planets or only 8? Astronomers have gone back and forth on that a lot, with Pluto now being classified as a dwarf planet. However, out beyond Neptune there could be ...