Planets

Planets are the backbone of Nebulous. Star systems can contain anywhere between one and five planets. On the rare occasion, with prayers to a deity, a system can contain up to seven planets.

Planet Info
Planets are used most importantly to build ships. Planets not building ships can be spun to produce credits up to a maximum of 10,000,000 per spin. All planets have a set size. This size determines how many habitats and industry zones can be built on each planet. Typically, planets are built up such that 50% of the total size is zoned for habitats and the remaining 50% is zoned for industry. Since the number of industrial zones cannot exceed the number of habitat zones, the 50-50 split is done to ensure that the planet has the highest production score it can attain so ships and credits are produced as quickly as possible.

Planet Types
There are 4 types of common planets and 2 types of rare planets

Rare Planets
The Dark Planet currently is held by Ogrim and was owned by Anonymous. Their info says that there is nothing special about it.