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| the universe was in a very high density state and then expanded |
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| The distance between all galaxies and Earth is increasing. Explains the expansion of the universe. |
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| Objects moving closer to the observer |
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| Objects moving away from the observer |
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| An interstellar cloud of dust, hydrogen, helium and other ionized gases. |
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| consist of a flat, rotating disc containing stars, gas and dust, and a central concentration of stars known as the bulge |
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| a galaxy that does not have a distinct regular shape |
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| a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly |
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