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physical science apologia lesson 16 definitions
definitions for apologias physical science lesson 16
7
Science
8th Grade
05/08/2014

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