Astronomers have discovered a star system that has five—or possibly six—planets that are in ‘orbital resonance’ with one-another, meaning that the time it takes for any given planet to orbit around its parent star will be a precise multiple (or fraction) of that of the orbit of any of theread more

Two new studies have provided further evidence for the existence of an as-of-yet undiscovered large planet at the edge of the Solar System, known by the astronomical community as “Planet Nine“.  Having found that the orbits of a number of trans-Neptunian objects (TNOs) on the outer fringe of the Solarread more