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The top documents tagged [structures of galaxies]
Galaxies What is a galaxy? How many stars are there in an average galaxy? About how many galaxies are there in the universe? What is the name of our galaxy?
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Celestial Sphere Imagine a sphere that surrounds our planet in which all the stars are attached. This sphere is allowed to rotate freely around the
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Types of Galaxies Elliptical: Spiral: Irregular:
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