AST101H1 Lecture Notes - Lecture 1: Milky Way, Local Group, Dwarf Planet

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AST101H1 Full Course Notes
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AST101H1 Full Course Notes
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Earth solar system milky way galaxy local group super cluster universe. Milky way galaxy: used both as the name of our galaxy and to refer to the band of light we see in the. Solar system: a star (sometimes more than 1) and all the objects that orbit it. ((cid:883)(cid:882)(cid:2869)(cid:2868)) sky. ((cid:883)(cid:882)(cid:2869)(cid:2876)) Local group: the group of about 40 galaxies to which the milky way galaxy belongs. (3 (cid:883)(cid:882)(cid:2869)(cid:2877)) groups of galaxies, and individual galaxies. ((cid:883)(cid:882)(cid:2870)(cid:2869)) Super cluster: the largest known structures in the universe, consisting of many clusters of galaxies, Universe: the sum total of all matter and energy. The average distance of earth from the sun. Distance that light can travel in 1 year. Used to describe distances of stars and galaxies. (cid:862)the farther away we look i(cid:374) dista(cid:374)(cid:272)e, the further (cid:271)a(cid:272)k we look i(cid:374) ti(cid:373)e. (cid:863) e. g. sirius is 8 light-years away. Therefore, it takes light 8 years to travel from sirius to earth.

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