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Across 4. carries nuclear missile miles and miles 6. a communist state 7. what Russian call astronauts 9. Russian launch vehicle 10. first man made thing in space 11. operating frequency of a radio 13. needs A-bomb to go off 14. first man in space 15. amount of time a stage of a rocket burns

Down 1. Mon Mar 21 16:54:22 2005 Start Mon Mar 21 16:54:22 2005 Finish the combining of lighter elements to make heavier ones 2. all manned space flights launched from 3. carried first animal into space 5. Soviet launch vehicle 8. Russian lunar space vehicle 12. second ruler of U.S.S.R