Planets of the Hainish Cycle third planet of our solar system. Terrans are descendents of colonists from Hain. At some unspecified date, Terrans join the "League of All Worlds", which includes the Cetians and other peoples of Hainish descent. In "The Left Hand of Darkness", it is said that 'Hainish Normal' people were placed among Terra's own proto-hominid autochthones by the ancient Hainish 'colonizers'. After that initial contact with Hainish civilization Terra experiences two more cycles of isolation followed by the restoration of extraterrestrial contact and community with other worlds. The second period of contact with the interstellar Hainish community is the background for "The
Planet Nine X, Planet Next, or Giant Planet Five." Planet Nine Planet Nine is a hypothetical planet in the outer region of the Solar System. Its gravity could explain the unlikely clustering of orbits for a group of extreme trans-Neptunian objects (eTNOs) that orbit beyond Neptune with average distances greater than 250 AU. These eTNOs tend to have their points of closest approach to the Sun clustered in one direction, and many of their orbits have a similar tilt. This evidence suggests that the gravity from a large undiscovered object is influencing the orbits of the most distant known Solar System objects.