It will also point those telescopes at one patch of the sky for long periods of time, allowing it to observe the relatively long orbital periods of planets in the habitable zone. (sciencemag.org)
Their orbits are not random but appear to be in a so - called chain of resonance, meaning that the orbital period of each planet is related to that of its neighbors by a ratio of small whole numbers. (sciencemag.org)
Do the orbital periods of the six resonant objects relate to the orbital period of Planet Nine? (findplanetnine.com)