Where Mars, Saturn, and more, orbit in miniature (11)

I believe the answer is:

planetarium

(Other definitions for planetarium that I've seen before include "Dome where the heavens are projected" , "one offering vision of heaven" , "Star-filled building" , "Where the night sky is projected onto a ceiling" , "Astral display" .)

I've seen this clue in the Sydney Morning Herald.

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