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Vocabulary about how the planets move and act

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
Axis   The imaginary line on which an object rotates  
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Rotation   The spinning of an object on its axis  
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Day   The time required for an object to rotate once on its axis  
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Orbit   The path that an object follows around another object in space  
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Revolution   The movement or motion of an object that travels around another object in space. One complete trip of an object around another object.  
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Year   The time it takes for an object to make one complete revolution around another object  
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24 hours   One Earth day, or one complete rotation of the Earth on its axis  
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365.24 days   One Earth year, or one complete revolution of the Earth around the sun  
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Diameter   A straight line that passes through the center of a circle or sphere  
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Mass   How much matter is in an object  
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Surface Gravity   The amount of gravitational pull experienced on the surface of an object  
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Created by: Marquart
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