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| The time it takes for the Earth to make a full rotation; the length of day and night on Earth |
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| The time it takes for the Earth to make a full revolution, or orbit, around the sun; the length of one year |
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| A group of stars that seem to form a pattern in the sky |
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| A bowl-shaped depression with a raised rim, formed by the impact of a meteorite |
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| Straight line passing through the center of a circle or sphere |
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| A curve shaped like an oval; the shape the Earth takes as it revolves around the Sun |
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| The natural force of attraction between any two massive objects, such as the Earth and Sun, which gets stronger the bigger the object |
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| The striking of one thing against another; collision |
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| Pertaining to the moon; examples: lunar eclipses, lunar phases |
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| A stony or metallic mass of matter that has fallen to the earth or moon's surface from outer space |
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| A natural satellite that orbits the Earth that shines by the Sun's reflected light |
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| The curved path around an object, such as the path a planet follows around the sun |
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| The different shapes of the moon as we see it from Earth during the time that the moon revolves around the Earth |
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| Any of the large bodies that revolve around the Sun in the solar system |
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| The trip a planet or satellite takes around another object |
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| The turning of the Earth on its imaginary axis |
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| A natural body, such as the moon, that orbits another object |
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| Anything that pertains to the Sun |
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| The Sun, eight planets, and the other objects that orbit the Sun in a predictable manner |
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| An organized group of parts that perform a function or process; example: weather systems, solar system, ecosystem |
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