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Stars, Galaxies, and the Universe !

Stars, Stellar Evolution, Star Groups & Big Bang Theory.

Genesis Redwan

on 26 May 2010

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Transcript of Stars, Galaxies, and the Universe !

Stars, Galaxies & the Universe ! To determine the composition and sufarface temperature of a star, astronomers study the spectrum of the star. Stars appear to circle Polaris each night and appera to move westward across the sky on successive nights. Astronomers use direct and indirect methods to measure the distance to a star. A red giant star is a cool star that has a core in which helim fusion is occuring. A protostar becomes a star when hydrogen begins to fuse into helium. Types of galaxies: Spiral, elliptical, irregular. Quasars are very bright galaxies with holes in the center.
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