The Observatory is an abandoned planetarium found behind the Football Field accessed either by the gates leading to the Football Field or via a secured gate near the library. Students are not allowed to enter the observatory. The player cannot enter the Observatory on Free roam.
According to Miss Danvers, The Observatory was shut down due to "safety" reasons but Earnest Jones turned it into a hideout of sorts for the Nerds, fortifying it and adding a defense system consisting of a spud cannon defending the outer gates, and nearly inaccessible girders from which various weapons can be fired on the inside. There are large destroyable models of the planets hanging from the ceiling.
Aside from cutscenes, the Observatory can only be entered during the Nerd Boss Fight. In fact, during free roam the door is boarded shut. The spud cannon on the walls, however, remains operable, and can be used against any students Jimmy baits into chasing him to the Observatory.
Until the Mission Stronghold Assault gets completed, access to the Observatory field or the tunnel will remain blocked by the wooden gates.
- If you enter the observatory using mods on free roam, you will get a full 1/3 trouble meter for "trespassing". This may indicate that the observatory originally was going to be accessible.