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SolarSystem/Universe

Topic 12: Lesson 4 Galaxies

QuestionAnswer
a group of single stars, star systems, star clusters, dust, and gas bound together by gravity galaxy
all of space and everything in it universe
the distance that light travels in one year, about 9.46 trillion km light-year
the theory that the universe formed in an instant, billions of years ago, in an enormous explosion big bang
find out, learn, or determine with certainty, usually by making an inquiry or other effort determine
Created by: ScienceWTRMS
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