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earth, sun, and moon words

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Term
Definition
Astronomy   The study of the moon, stars, and other objects in space.  
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Axis   Imaginary line that passes through Earth's center and the north and south poles  
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Rotation   Spinning of Earth on its axis.  
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Revolution   The movement of one object around another.  
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Orbit   A path.  
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Solstice   When the sun is farthest North or South of the equator.  
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Equinox   Neither hemisphere is tilted toward or away from the sun  
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Gravity   Forces that attract all objects all objects toward each other  
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law of universal gravitation   Every object in the universe attracts every other object  
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Mass   The amount of matter in an object  
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Weight   A measure of the force of gravity on an object.  
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Inertia   The tendency of an object to resist any change in its motion.  
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Newton’s First Law of Motion   an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction  
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