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Universe

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Across
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A celestial object that has a gravitational collapse, which increases the star's luminosity
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A series of stars types in a band from the upper left (hot bright stars) to the lower right (cool dim stars)
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All of time & space and its contents includes planets, moons, stars, galaxies, asteroids
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The explosion of a star, possibly caused by a gravitational collapse, which increases the stars luminosity
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A cloud of gas and dust in outer space
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A galaxy without a distinct shape. among the smallest galaxies. They contain a lot of gas and dust with continuous star formation
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A galaxy having an elliptical shape, three dimensional with random orbits around its center
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A sphere made up of extremely hot gases
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A spiral shaped galaxy that contains our solar system
Down
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A galaxy also known as "disc" galaxies that have used up their interstellar matter with little star formation
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A gravitational bound system of stars, separated from similar systems by vast region of empty space
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A galaxy having an elliptical shape, three dimensional with random orbits around its center
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It is the natural force of attraction that causes to fall toward the Earth
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The total amount of luminous energy emitted by a star
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A graph that plots stars organized by luminosity and by their temperature
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The start that is the center of our solar system