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ERM 8th Sci Mod 16

Apologia Physical Science 2nd Ed - An Introduction to Astrophysics

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, on 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
The regions of the sun from the inside to the outside core, radiation zone, convection zone, photosphere
What part of the sun do we see? photosphere
When a large nucleus splits into two smaller nuclei (and a few neutorons), it it nuclear fission or nuclear fustion? nuclear fission
When two small nuclei become a bigger nucleus (plus a neutron), it is nuclear fusion or nuclear fission? nuclear fusion
The sun is a big ball of ? and ? hydrogen and helium
What occours in the sun's core? nuclear fusion, turning hydrogen into helium, producing energy which makes the heat and light
What is a better means of producing energy so that there are no radioactve byproducts, no chance of meltdown, and the starting materials are cheap? nuclear fusion
If nuclear fusion is a better option, why don't we use it? we cannot master the technology to make it economically feasible
Can a nuclear power plant explode? no, because ther isn't enought of the large nucleus to allow the chain reaction - - but it can meltdown
Created by: supermommorris on 2012-07-13

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