A Delta Quadrant planet with a tachyon core on which time passes thousands of times faster than in normal space, whose civilisation grows up watching the trapped Voyager in its sky in Blink of an Eye.
The planet, never named on screen and known after Kelemane, one of the first inhabitants seen, appears in the Voyager episode Blink of an Eye, set in 2376. Roughly one second aboard the ship equals a day on the surface.
Voyager is pulled into orbit and held there, its presence causing regular earthquakes below. As days pass on board, the people of the planet advance from a tribal society to an industrial and then a space-faring one, and the bright Sky Ship shapes their religion, science and stories. The Doctor is sent down to observe and spends three years among them.
Two astronauts finally reach the ship, and one, Gotana-Retz, survives the transition. When his people begin bombarding Voyager with ever better weapons, he goes home and persuades them to pull the ship free.