Moonbase Two

Moonbase Two, Moon Beta, or Luna 2, is one of Cybertron's moons. The other ones are Moonbase One, Moonbase 3, and Moon Base Four.

Generation One cartoon continuity
Moonbase Two was the second Moon base built after the Decepticons' conquest of Cybertron. It appeared to be smaller and less extenstive than Moonbase One. Spike Witwicky and Bumblebee were stationed on it. Like Moonbase One, it existed just long enough for Unicron to come along and eat it. Unlike Moonbase One, it actually got to violently explode in a (feeble) attempt by Bumblebee and Spike to destroy Unicron.

The AllSpark Almanac
Moon Base Two was Cybertron's outer, smaller moon. It served as an impressive communications and computer facility.

Aligned novels
Moonbase Two orbited Cybertron.

IDW Generation 1 continuity
Luna 2 was originally famous for its hot spots, and when they cooled it became famous for energon mines. With the disappearance of the larger Luna 1, only Luna 2 remained in Cybertron's orbit.

Luna 2 once had its own set of laws different from Cybertron's, remaining from the days of the Knights of Cybertron, though they were mostly forgotten by present day. Pre-war, during the Senate's peak of corruption, they put their maximum security prison Garrus-1 on the moon. It was also the location of the Thymesis Energon mining facility where Overlord's spark was discovered 4.2 million years ago.

Starscream once led an attack on Luna 2 that would become considered one of the most important and terrible events of the war. At some point there was a Moonbase 2 there.

According to Roadbuster, the amount of energy used up by the life-support machines on Debris in a single day would have been enough to light up the dark side of Luna 2.

Like Cybertron, Luna 2 was ruined and abandoned during the war, but once Vector Sigma was reignited and the planet was reborn, it automatically began reviving the remaining moon by transmitting energy into it. During the Necrotitan's attack on Iacon, Megatron's wanted to evacuate the population to the moon for a chance to mobilize his Decepticons against the threat.

After surrendering to the Autobots, Megatron requested his trial be held at Luna 2's Raskol Arena, claiming it was the only place large enough for the population to participate. In fact he was aware of Luna 2's ancient-but-valid laws, and guided the trial towards a loophole that let him demand to be judged by the Knights of Cybertron themselves.

The Functionist Universe
As part of a peace treaty to settle a two million year-conflict with the Black Box Consortia, the Functionist Council of Cybertron was forced to sell Luna 2 to the Consortia. Consequently, all Lunabots were "recalled" as they had been rendered obsolete.

Beast Wars: Uprising
Luna 2 could be seen in the skies of Cybertron. When the Resistance launched a raid on Fortress Maximus in Tarn, Lio Convoy was silhouetted against Luna 2 as he jumped off a transport. Bighorn later commented that Buzzclaw had so much baggage that it could be seen from Luna Two. For that reason, the Resistance chose Buzzclaw for the mission into Fortress Maximus, where Buzzclaw would be bait for Maximus's psychic influence.

Super INFINITY
Moonbase Two, or Luna 2, is Cybertron's second moon.