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Apologia - Physical Science - Module 16: An Introduction to Astrophysics

Vocabulary from Module 16 of Apologia Educational Ministries' Exploring Creation with Physical Science (2nd Edition) by Dr. Jay Wile
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Nuclear fusion
The process by which two or more small nuclei fuse to make a bigger nucleus
Nuclear fission
The process by which a large nucleus is split into smaller nuclei
Critical mass
The amount of isotope necessary to sustain a chain reaction
Absolute magnitude
The brightness of a star, corrected for distance, aon a scale of -8 to +19. The smaller the number, the brighter the star.
Apparent magnitude
The brightness of a star as seen in the night sky. The smaller the number, the brighter the star.
Light year
The distance light could travel along a straight line in one year
Galaxy
A large ensemble of stars, all interacting through the gravitational force and orbiting around a common center