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6 Cards in this Set
- Front
- Back
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electromagnetic spectrum
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arrangement of electromagnetic waves according to their wavelength.
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observatory
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building that can house an optical telescope; often has a done seaped roof that can be opened for viewing.
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orbit
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curved path followed by a sattelite as it revolves around an object.
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Project Apollo
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final stage in the U.S. program to reach the Moon in which an Neil Armstrong was the first human to step on the Moon's surface.
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Project Gemini
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second stage in the U.S. program to reach the Moon in which an astronaut team connected with another spacecraft in orbit.
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Project Mercury
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first step in the U.S. program to rech the Moon that orbited a piloted a space craft around earth and brought it back safely
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