PUZZL 1950S

4. - The act of safely bringing a spacecraft to the ground.
6. - The name of a series of United States satellites launched during the Space Race.
9. - A series of United States space missions launched in the late 1950s.
11. - A vehicle propelled by engines that expel gases at high speeds.
12. - Relating to the Moon, as in "lunar landing" or "lunar orbit."
13. - The United States' National Aeronautics and Space Administration, founded in 1958.
14. - The site of many United States space launches during the Space Race.
16. - The first artificial satellite, launched by the Soviet Union in 1957.
17. - A Soviet astronaut or space traveler.

1. - A series of United States satellites, including the first American satellite launched in 1958.
2. - A vehicle designed for travel or operation in outer space.
3. - The moment when a rocket begins its ascent into space.
5. - The first United States human spaceflight program.
7. - The act of an astronaut moving around in space outside a spacecraft.
8. - The celestial body orbited by both Soviet and American spacecraft during the Space Race.
10. - The name of a family of United States rockets used during the Space Race.
11. - The competition between the United States and the Soviet Union to achieve milestones in space exploration.
12. - The name of a series of Soviet spacecraft sent to the Moon.
15. - The second Soviet spacecraft to reach the Moon, launched in 1959.
18. - The path followed by a spacecraft as it revolves around another object in space.