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| a small rocky body the orbits the sun; is not considered a planet |
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| the study of celestial objects, space and the universe |
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| the mixture of gases that surrounds the Earth or other celestial bodies |
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| the imaginary line about which a rotating body, such as the earth, turns; tilted 23 degrees |
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| any natural object outside Earth's atmosphere |
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| celestial body of ice, dust, and a tail of gases and dust |
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| the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth |
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| a system of millions or billions of stars with gas, dust, and other celestial objects held together by gravity |
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| the force that attracts two objects together |
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| one half of the Earth; divided horizontally |
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| occurs when the moon enters the Earth's shadow |
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| a burning body of matter that has entered Earth's atmosphere; "shooting star" |
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| the galaxy that contains Earth's solar system |
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| National Aeronautics and Space Association |
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| the path of an object that revolves around another object |
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| a celestial body that does not produce its own light; moves in an elliptical orbit around a star |
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| an optical instrument for making distant objects appear larger and therefore nearer |
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| the turning of an object on its axis |
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| a natural body that revolves around a planet; a moon |
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| time of the year related to Earth's changing position |
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| occurs when the moon comes between the Earth and the Sun |
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| a system of planets or other bodies that orbit a star |
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| either of the two times a year when the sun is at its greatest distance from the celestial equator |
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| an orbiting manned structure that can be used for a variety of purposes, as to assemble or service satellites, refuel spacecraft, etc. |
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| an optical instrument for making distant objects appear larger and therefore nearer |
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| the rising and falling of the water level of the oceans due to the pull of gravity |
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| the angle between an object's rotational axis |
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| includes all existing matter and space |
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| occurs when the moon appears to be shrinking |
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| occurs when the moon appears to be growing |
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