Building a capitol on a planet changes your home planet to the planet where you built the capitol. You may only have one Capitol per empire. Your home planet is immune to the spy missions Insurrection and Appropriate Technology. In addition, through the use of the Stockpile, you can build resource buildings past level 15 on your Capitol planet. As an added bonus the capitol produces a small amount of additional Happiness.
The Entertainment District increases your empire's happiness by providing a place for your citizens to unwind through activities such as casinos, restaurants, clubs and other amusements. The higher the building level the more happiness is produced. Be careful, it can also produce a lot of waste, which could negate some of the happiness it produces.
Great Ball of Junk
The Great Ball of Junk is a monument that you can build on your planet entirely out of waste. Once built it provides huge amounts of happiness through tourism.
Junk Henge Sculpture
The Junk Henge Sculpture is a monument that you can build on your planet entirely out of waste. Once built it provides huge amounts of happiness through tourism.
Luxury Housing helps increase the happiness of your planet. It has a much better happiness density than the Entertainment District, but also costs a lot more.
Metal Junk Arches
The Metal Junk Arches is a monument that you can build on your planet entirely out of waste. Once built it provides huge amounts of happiness through tourism.
Network 19 Affiliate
The Network 19 Affiliate is your empire's source for up to the minute news in your region of the Expanse. Get updates on what other empire's are doing and what you'd prefer they weren't doing. The Network 19 feed can be manipulated through the use of of espionage and political policy. Well informed people are happy people so the network also produces happiness. The higher the building level the more of the expanse you can get news from and the more happiness is produced. Also if you use the option to restrict media the happiness normally generated by this building is instead subtracted.
The Park is a place for your people to gather and enjoy nature or hold large scale public events. The Park allows you to throw parties for your citizens to increase their happiness. The more varieties of foods you bring to the party the more happiness is produced. Increasing the level of the park also increases the happiness produced by parties, but not nearly as much as extra food types do.
Pyramid Junk Sculpture
The Pyramid Junk Sculpture is a monument that you can build on your planet entirely out of waste. Once built it provides huge amounts of happiness through tourism.
Space Junk Park
The Space Junk Park is a monument that you can build on your planet entirely out of waste. Once built it provides huge amounts of happiness through tourism.
The Theme Park is the ultimate source of happiness you can build, but relies on careful management to maximize happiness generation. Limit of 2 per planet.
The University is a place of higher learning and knowledge for your people and is the key to growth for your empire. Other buildings cannot be upgraded higher than the university level plus 1. Your university's level is empire wide where construction level of buildings on other planets is concerned. Many of the more powerful buildings that can be constructed require a very high level University. The University is also a source of happiness for empire. Note: If you do lose you University for some reason by Demolishing it, Abandoning the planet it is on, or should it be lowered in level because you downgrade it or because of the spy mission Appropriate Technology, your empire will still maintain the same University level of technology that you had before the loss. To increase your University Level you will need to rebuild up to the level that you had before and then continue to level the University 1 level at a time. It used to be possible that you could take control of a planet with a level 29 University even if you only had a university of for example level 10 and then upgrade the University a single level and suddenly jump from University level 10 to University level 30. This is no longer the case. To increase your University level now from 10 you would need to upgrade a University to level 11. There is no way to lower the University level of your empire currently it game. It can be done by a game admin but will likely only happen in the case of rules violations. Once your University level reaches 30 it is currently impossible to increase the level further. Some players like to keep their University at this point because of the happiness it produces despite the high maintenance costs. Others keep it in hopes of eventual higher level tech coming out, or just as a memento of their hard work. Each university level above 25 will give +1 to the maximum level a normal resource building can go; for a max of +5 at university level 30 (the university itself is not required to maintain this bonus). Added to the maximum stockpile bonus, that means the capitol's normal resource buildings can reach level 30 while those on other planets can reach level 20.