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25.3 The Universe ,[object Object]
Galaxy ,[object Object],A group of stars, dust, and gases held together by gravity.,[object Object]
Galaxy Cluster ,[object Object],A system of galaxies containing from several to thousands of member galaxies.,[object Object]
Hubble’s Law,[object Object],A law that states that the galaxies are retreating from the Milky Way at a speed that is proportional to their distance.,[object Object]
Big Bang Theory,[object Object],The theory that proposed that the universe originated as a single mass, which subsequently exploded.,[object Object]
Key Concept,[object Object],The milky Way is a large spiral galaxy whose disk is about 100,000 light-years wide and about 10,000 light-years thick at the nucleus.,[object Object]
Key Concept,[object Object],In addition to shape and size, one of the major differences among different types of galaxies is the age of their stars.,[object Object]
Key Concept,[object Object],The red shifts of distant galaxies indicate that the universe is expanding.,[object Object]
Key Concept,[object Object],The big bang theory states that at one time, the entire universe was confined to a dense, hot, supermasive ball. Then, about 13.7 billion years ago, a violent explosion occurred, hurling this material in all directions.,[object Object]

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Earth science 25.3

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