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Components of the universe

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Across
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Distance that light travels in one year
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Stars that are in middle of life cycle
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Means brightness
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When blue stars are hotter and red stars are colder
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Group of galaxies
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Masses of rock left over from plants.
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It is a collection of billions of stars
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When stars gravity is strong enough that it squeezes the gas together sop tight that this occurs
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They are rotating disks with the appearance of arms
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A spiral shaped galaxy
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A galaxy that has older red stars and have very low rates of star formation
Down
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Most of these orbit between mars and Jupiter
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Each one is unique in shape,age and structure
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A very masses object orbiting the sun
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10-15 billion years ago,our universe came into existence
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They contain materials needed for the creation of stars
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They are left over from the formation of stars and plants billions of years ago
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What is a Gigantic ball of gas,mostly hydrogen gas
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Closest star to earth and is in the center of our solar system