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Across 1. An optical telescope that uses convex lenses. (2 Words) 5. The goal of this U.S. Project was to orbit a piloted space craft around Earth and bring it safely back. 8. Any object that revolves around another object. 10. The name of the path taken by a satellite that is pulled toward Earth by gravity and moving forward at the same time. 13. The goal of this U.S. Project was to put an astronaut on the moon. 14. Engines that have everything they need for the burning of fuel. 18. An optical telescope that uses concave mirrors to amplify light. (2 Words) 19. An orbiting spacecraft that contains living quarters, work areas, and all the equipment needed for astronauts to work and live in space. (2 Words) 20. The arrangement of electromagnetic radiation according to wavelength. (2 Words)

Down 2. The latest space station designed to be a laboratory for long-term research projects in space. (3 Words) 3. The goal of this U.S. Project was to have two spacecraft teams meet in space and join together. 4. A space station where U.S. astronauts lived for up to 84 days at a time. The main goal of this space station was to study the long-term effects on humans of living in space. 6. A telescope that studies radio waves traveling through space. (2 Words) 7. The first space station on which the U.S. and Russia began a cooperative effort to learn about space. 9. A reusable space craft that transports astronauts, satellites, and other materials to and from space. (2 Words) 11. The term used to describe an astronaut of the former Soviet Union or present-day Russian space program. 12. The force that propels an aircraft or missile. 15. An instrument that can magnify the size of distant objects. 16. An instrument that gathers data and sends it back to Earth. These instruments do not return. (2 Words) 17. Optical telescopes housed in dome-shaped buildings for use by professional astronomers.