Phobos

Phobos was a moon of Mars. It was named after Phobos, the ancient god of fear.

History
The Ice Warriors created Phobos. (VD: Crimson Dawn)

It had a wormhole located on its surface. By the year 2589, Phobos served as a popular destination for devotees of such "extreme sports" as jumping the wormhole.

Due to its ellipsoid shape and its proximity to Mars the gravity on the surface of Phobos altered dramatically throughout its orbit around Mars. By the 26th century humans had established themselves on Phobos, building such structures such as Mars Luna Park, an environment dome that maintained a fixed gravity within. Humans also visited Phobos for its range of "extreme sports" such as gravity-boarding and wormhole-jumping. (BBCR/BFA: Phobos)

Phobos was of strategic importance in the war against the Daleks. Had the colonists entered the war on the side of the humans, the Daleks would have lost. For this reason the Daleks under Davros' guidence bombarded the planet ensuring that nothing survived. (BE: ''An Incident Concerning the Continual Bombardment of the Phobos Colony)

Other historical information
Josiah W. Dogbolter, who at that time owned the planet Mars itself, monitored a war going on in Phobos. (DWM: The Moderator)