Jupiter and Neptune are the only planets in the Solar System not represented by any items of this kind.All of the Planetarium items resemble celestial bodies from the Solar System: Sol and Luna resemble the Sun and the Moon respectively, while the rest of the items stand for the planets from Mercury to Pluto.
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Planetariums are unlocked by possessing three astrology-related items simultaneously. Like Treasure Rooms, they require a key to enter. The Planetarium is a new unlock-able room type introduced in Antibirth that has a small chance to appear after certain criteria are met. For a list of other rooms featured in Antibirth, check out Chapters.