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The Clue

Sites for stargazers (10 letter answer)

The Answer

PLANETARIA

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Notes

The answer PLANETARIA is so rare that it appears less than once every 2500 puzzles.

Definition

PLANETARIUM as a noun:

1. a building housing an instrument for projecting the positions of the planets onto a domed ceiling
2. an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome
3. an apparatus or model for representing the solar systems