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| the scientific study of the universe |
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| a collection of stars, dust, and gas bound together by gravity |
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| the average distance between Earth and the sun; approximately 150 million kilometers |
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| all of the frequencies of wavelengths of electromagnetic radiation |
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| an instrument that collects electromagnetic radiation from the sky and concentrates it for better observation |
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| a telescope that uses a set of lenses to gather and focus light from distant objects |
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| a telescope that uses a curved mirror to gather and focus light from distant objects |
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| the spin of a body on its axis |
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| the motion of a body that travels around another body in space; one complete trip along an orbit |
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| in the orbit of a planet or other body in the solar system, the point that is closest to the sun |
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| in the orbit of a planet or other body in the solar system, that is farthest from the sun |
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| the moment when the sun appears to cross the celestial equator |
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| the point at which the sun is as far north or as far south of the equator as possible |
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