US space station launched in May, 1973 (6)

I believe the answer is:

skylab

(Other definitions for skylab that I've seen before include "Weather research centre that's out of this world" , "research unit once in orbit" , "US space station launched in 1973" , "1973-79 space station" , "Early US space station" .)

I've seen this clue in The Mirror.

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