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

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Vocabulary from Module 16 of Apologia Educational Ministries' Exploring Creation with Physical Science (2nd Edition) by Dr. Jay Wile

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

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