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| arrangement of electromagnetic radiation according to wavelength |
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| optical telescope that uses a double convex lens to focus light and form an image at the focal point |
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| optical telescope that uses a mirror (or mirrors) to focus light and produce an image at the focal point |
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| specially designed building, often with a dome-shaped roof that opens up to admit light, it is used to house optical telescopes |
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| type of telescope that uses a large, curved dish to collect and record radio waves traveling through space and that can be used during the day or at night and during bad weather |
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| any object that revolves around another object and can be natural or artificial |
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| curved path of a satellite as it revolves around an object in space |
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| instrument that travels out into the solar system to gather information and sends the data back to Earth |
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| first step in the U.S. effort to reach the moon, in which a piloted spacecraft successfully orbited around Earth and returned safely |
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| second stage in the U.S. program to reach the moon, in which a team of astronauts met and connected with another spacecraft while in orbit |
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| final stage in the U.S. effort to reach the moon -- on July 20, 1969, Neil Armstrong was the first human to set foot on the lunar surface |
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| reusable spacecraft that carries astronauts, satellites, and other materials to and from space |
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| large artificial satellite that provides support systems, living quarters, and equipment so that humans can live and work in space and conduct research not possible on Earth |
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