AST201H1 Chapter : Astronomy Vocabulary from the Textbook Compiled
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AST201H1 Full Course Notes
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Chapter 1 our place in the universe. Solar system a star (sometimes more than one) and all the objects that orbit it. Milky way galaxy name of our galaxy and the band of light we see in the night sky. Galaxy - huge collection of a few hundred million to more than a trillion stars bound by gravity. Local group the group of about 40 galaxies to which the milky way belongs. Galaxy clusters collection of a few dozen or more galaxies bound together by gravity. Superclusters largest known structures in universe consisting of many galaxy clusters. Universe sum total of all matter and energy. Big bang event thought to mark the birth of the universe. Nuclear fusion process when two or more smaller nuclei slam together to make a larger one. Asteroid relatively small rocky object orbiting a star. Comet relatively small ice-rich object that orbits a star.