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Chapter 22
- 9. Optical telescopes are often located in buildings called observatories, which often have roofs that can be opened for viewing.
- 17. A satellite –any object that revolves around another object in an orbit, or curved path.
- 18. In 1957 the former Soviet Union launched the first artificial satellite, Sputnik I.
- 21. Voyager 1 and Voyager 2 are exploring space beyond the solar system.
- 25. First step in program to reach the Moon began with Project Mercury.
- 26. In 1961, Alan B. Shepard became the first U.S. citizen in space.
- 27. In 1962, John Glenn became the first U.S. citizen to orbit Earth.