In 1977 this Nasa program launched probes to Jupiter, Saturn and beyond (7)

I believe the answer is:

voyager

(Other definitions for voyager that I've seen before include "Seafarer" , "Sea or space traveller" , "Traveller to a distant land" , "One on a long journey" , "Traveler to a distant land" .)

I've seen this clue in The Times and The Sunday Times.

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