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12.1
The Night Sky
4
Physics
9th Grade
05/12/2013
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Term
Astronomy
 Definition
the branch of science that involves observations and explanations of events and objects that occur beyond Earth and its atmosphere.
Term
An astronomer
 Definition
a scientist who studies astronomy
Term
Rotation
 Definition
the spinning of an object around an imaginary line called an axis.
Term
Revolution
 Definition
the motion of an object around another object
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