Sontar

Sontar, sometimes called Sontara, was the home planet of the Kaveetch, who created the Sontaran clones during their war with the Rutans. The cloned Sontarans eventually became the planet's rulers.

Sontar originally orbited its star like any other planet, but by 1609 it had been modified so that the star orbited Sontar, as a more "logical" pattern. (PROSE: The Empire of Glass)

Sontar generated a gravity level six times higher than Earth. (TV: The Last Sontaran, WC: Monster File: Sontarans) However, its gravity was not used to bolster the muscular fitness of Sontarans. The Sontarans actually had such strong physiques and muscles due to being created on Sontar's Moon, within its even higher gravity. (AUDIO: The First Sontarans)

Sontar had large octagonical structures on its surface. (WC: Monster File: Sontarans, COMIC: Pureblood)