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The phrase "a planetarium" is correct and usable in written English.
You can use it when referring to a building or place that houses a theater for presenting astronomical shows and educational programs about space.
Example: "We took the children to a planetarium to learn about the stars and planets."
Alternatives: "an observatory" or "a space theater".
Exact(56)
But a planetarium?
There's also a planetarium and an aquarium.
Once, we went to a planetarium in Sunshine City.
I lived a few blocks from a planetarium.
The South Florida Science Museum has a planetarium and aquarium.
All feature tiny white lights that create a planetarium effect.
A planetarium occupied the interior of the sphere.
This was the first model to be called a planetarium.
A planetarium projector is complex and, naturally, expensive.
Similar(2)
When the smoke cleared, Stelling looked high, as in: high-school-junior-at-a-planetarium high.
When the smoke cleared, Stelling looked high, as in: high-school-junior-at-a-planetarium high.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com