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An Introduction to Astrophysics

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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Question
Answer
Nuclear fusion   The process by which two or more small nuclei fuse to make a bigger nucleus  
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Nuclear fission   The process by which a large nucleus is split into smaller nuclei  
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Critical mass   The amount of isotope necessary to sustain a chain reaction  
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Absolute magnitude   The brightness of a star,corrected for distance,on a scale of -8 to +19.The smaller the number,the brighter the star  
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Apparent magnitude   The brightness of a star as seen in the night sky.The smaller the number,the brighter the star  
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Light year   The distance light could travel along a straight line in one year  
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Galaxy   A large ensemble of stars,all interacting through the gravitational force and orbiting around a common center  
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Created by: Makenshi
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