The planetarium is an area inside the Museum of Technology, found in the Mall. The easiest way to get there is to take Anacostia Crossing station to the Museum station, and to take the Museum of Technology exit from there.
The planetarium consists of the main hall with the projector in the center of a circle of seats for the audience. The audience circle also contains the show control terminal. To the side is a maintenance room which consists of tools and other supplies.
There is nothing in the planetarium itself, but there is a small equipment cache left in the maintenance room. Inside is a Nuka-Cola Quantum and a locked weapons locker.
- The key to the cabinet can be found in the unmarked quest, Jiggs' Loot. It is in a safe in the museum's security office.
- One can also activate the planetarium show by activating the big machine located in the center of the room, which malfunctions and repeats itself after a while. However, it can be activated at any time using the nearby terminal.
- Upon exiting the room with the gun cabinet (indicated in the quest Jiggs' Loot), 2-3 super mutants of varying difficulty will enter the planetarium.
- Having subtitles enabled will make the planetarium speech subtitle to appear constantly in the west wing, even when far enough to not hear it.
The planetarium appears only in Fallout 3.