HUBBLE

Set to 3 different clues across 4 published puzzles, most often “Telescope name” — The New York Times, Wednesday, 28 June 2000.

6 letters

Every clue on record, most used first

Telescope name2 times
The New York Times — Wednesday, 28 June 2000
Eye in the heavensonce
The New York Times — Thursday, 3 April 2008
Big name in big telescopesonce
The New York Times — Wednesday, 25 September 1996