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Module 16 vocab

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Across
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A large ensemble of stars, all interacting through the gravitational force and orbiting around a common center
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The amount of isotope necessary to sustain a chain reaction
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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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The process by which a large nucleus is split into smaller nuclei
Down
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The distance light could travel along a straight line in one year
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The brightness of a star as seen in the night sky. The smaller the number, the brighter the star
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The process by which two or more small nuclei fuse to make a bigger nucleus