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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Telescope users. 6 letters:

GAZERS: Telescope users.
RADIOASTRONOMER: Green Bank Telescope user
STARMAP: Telescope user's aid
ASTRONOMER: Radio telescope user
GAZER: Telescope user.
EYER: Telescope user
STARGAZER: Telescope user