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The Clue

Copernican concern (9 letter answer)

The Answer

ASTRONOMY

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Notes

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

Related Clues

Star study
Urania's domain
Uranologist's field

Definition

ASTRONOMY as a noun:

1. (astronomy, uranology) = the branch of physics that studies celestial bodies and the universe as a whole