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Science related flash cards

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Gravity   A physical force of nature that causes two bodies to attract each other.  
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Force   A push or pull upon an object resulting from the interaction with another object.  
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Galaxy   A grouping of billions of stars. Ours is known as the Milky Way.  
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Universe   All existing matter and space considered as a whole.  
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Asteroid   A small planetary body in orbit around the Sun, larger than a meteoroid but smaller than a planet.  
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Comet   A gigantic ball of ice and rock that orbit the Sun.  
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Meteor   A small particle of rock or dust that burns away in the Earth's atmosphere.  
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Inner Planets   The 4 closest planets to the sun: Mercury, Venus, Earth, and Mars.  
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Outer Planets   The 4 farthest planets from the sun, also known as the gas giants: Jupiter, Saturn, Uranus, and Neptune  
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Orbit   The path of a celestial body as it moves through space.  
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