Astronomy Today@astronomytodayAstronomers have found a large object beyond Neptune that moves around the Sun in the opposite direction to almost everything else in our solar system.
Called R631 for now, it is about 62 miles wide and lies roughly 3 billion miles away, taking around 548 years to complete one orbit.
It may be a comet that starts releasing gas at its closest approach to the Sun in 2047. It may have come from another star system, or been flung onto this path by Neptune or Jupiter. Researchers will keep watching it, though answers may be a while off.
