Astronomer's tool (9)

I believe the answer is:

telescope

(Other definitions for telescope that I've seen before include "Instrument for viewing distant objects" , "View distant objects through it" , "Optical instrument for distant viewing" , "Astronomer's instrument" , "Shrink - optical instrument" .)

I've seen this clue in The Star Tribune, The Washington Post, the USA Today and the L.A. Times Daily.

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