Crossword Genius

Observatory observation (4)

Ross

I believe the answer is:

nova

'observatory observation' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for nova that I've seen before include "It shines" , "Star showing a sudden, brief increase in luminosity" , "Faint star that suddenly flares into brightness and then fades again" , "Star suddenly erupting in brightness" , "Star that becomes much brighter for short time" .)

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