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Grade 8 8.8(A)

describe components of the universe, including stars, nebulae, and galaxies...

Universe space and all the matter and energy in it
Star a large celestial body that is composed of gas and that emits light
Nebula a large cloud of gas and dust in interstellar space; a region in space where stars are born
Galaxy a collection of stars, dust, and gas bound together by gravity
Hertzsprung-Russell diagram a graph that shows the relationship between a star's surface temperature and absolute magnitude
Nuclear reaction A reaction, as in fission, fusion, or radioactive decay, that alters the energy, composition, or structure of an atomic nucleus.
Milky Way Galaxy the galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky
Luminosity the actual brightness of an object such as a star
Spectral Class any of various groups into which stars are classified according to characteristic spectral lines and bands.
Kelvin A unit of absolute temperature equal to 1/273.16 of the absolute temperature of the triple point of water.
Created by: sstall