[Tee tiong huat]

Wide-orbit planets are those circling their home star at least 100 times farther than Earth orbits the sun. These planets might not be so rare. In fact, they could be the natural result of chaotic early solar system development for stars in star clusters, said researchers. Some planets – like a hypothetical Planet 9 – could be flung out of the inner regions of the solar system but remain in the system thanks to gravity from nearby stars.

https://earthsky.org/space/wide-orbit-pl...-planet-9/