The Moon

The largest natural satellite of Earth, The Moon has a storied history.

Origin
The specific physical origin is unknown. It wasn't seen to form at the same time as the Earth (DW: The Runaway Bride), and the Silurians reported that it did not appear in Earth's sky until their time (DW: Doctor Who and the Silurians).

Human bases
By the late 21st century, Humans had at least one base on the Moon. One functioned as a T-Mat relay, co-ordinating T-Mat on Earth (DW: The Seeds of Death),

By 2070, a base housed the Gravitron, a machine for regulating Earth's weather. (DW: The Moonbase).

By 2540, it served as a penal colony for dissidents against the war between Earth's empire and the Draconians. (DW: Frontier in Space)

By the time of the Fourth Great and Bountiful Human Empire, the Earth had five moons. (DW: The Long Game)


 * We do not know if, by this time, the original natural moon still existed or the nature (artificial or natural) of the moons mentioned in passing.

Other bases

 * Sometime before the late 20th century, the Cybermen established a base on the dark side of the Moon capable which served as the staging area for a fleet poised to invade Earth. It also could fire missiles as the approaching craft such as the Doctor's TARDIS. (DW: The Invasion)


 * Prior to 2001 there wasa base on the Moon at Tycho crater Movements suggesting active lifeforms further north in the Eratosthenes crater were spotted as early as 1924 (visittorchwood.co.uk). However, this apparently had nothing to do with the Judoon or the Plasmavores, the only races to go near the Moon at that time. (DW: Smith and Jones)

Other information

 * Moonlight, concentrated in a laser-like beam, killed the Host at Torchwood House. (DW: Tooth and Claw)


 * The Moon was, during and before the 21st century, considered "Neutral Ground" by Galactic Law, meaning that if the Judoon needed to visit the Earth about a crime, they needed to move the place where they would have nneded to go - in the only case when this happened, the Royal Hope Hospital, London - to the Moon. (DW: Smith and Jones)