Possible Clues:

• Early space traveler
• It means "traveling companion" in Russian
• Soviet revolutionary family has sex in a revolutionary way
• One of a series of ten artificial Earth-orbiting satellites launched by the former Soviet Union
• Early Soviet satellite
• Satellite dish - it's punk!
• Newsmaker of October 4, 1957
• First satellite
• A 9's unusual input into cover for schoolbook
• Startling newsmaker of 10/4/1957