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 Just One of the Group

Just One of the Group

A Short Reader

Reading Level
     edHelper's suggested reading level:   grades 6 to 8
     Flesch-Kincaid grade level:   5.69

Vocabulary
     challenging words:    trillion, orbit, billion, estimate, universe, gravity, spiral, telescope, space, source, believe, system, center, study, alone, part
     content words:    Milky Way, Milky Way Galaxy, Way Galaxy, Edwin Hubble, Local Group

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Just One of the Group
By Cindy Grigg 		  
1     Artist's conception of the Milky Way galaxy
 
2     We know that Earth orbits the sun. Making that trip around the sun takes Earth 365 and one-fourth days. Our sun is a medium-sized star. We also know that seven other planets as well as other smaller bodies orbit the sun. These planets, comets, asteroids, moons, and other bodies are part of our solar system.
 
3     Our solar system is part of a galaxy we call the Milky Way Galaxy. A galaxy is a group of stars, planets, dust, and gas. The galaxy is held together by gravity, just as our solar system is held together by the sun's gravity. Our sun is at the center of our solar system. The gravity from the sun is what holds the planets and other bodies in their orbits. What is at the center of a galaxy? Many scientists believe that a black hole is the source of a galaxy's gravity.

Paragraphs 4 to 6:
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