Answer: spacerace

AnswerCrossword Clue
SPACERACECompetition with rockets
SPACERACESputnik started it
SPACERACE'60s competition
SPACERACEExploration competition started by Sputnik
SPACERACENASA's concern
SPACERACECompetition covering many miles
SPACERACEContest with many missions
SPACERACEOld U.S.-Soviet rivalry
SPACERACESputnik 1 launched it
SPACERACECompetition that began in 1957
SPACERACECold War competition
SPACERACEIt was launched with Sputnik