What are galaxies? (Topic:Constellations And Galaxies)
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Galaxies are a massive system of stars, gas, dust and dark matter, all of which orbit around the common centre of mass and are bound together by gravity.
Galaxies come in many different shapes and sizes; the two main type of galaxies are elliptical galaxies and spiral galaxies.
However, many other types exist such as dwarf galaxies, irregular galaxies and visible galaxies.
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A galaxy consists of a large number of stars,planets,dwarf planets,satellites,artificial satellites,meteors,asteroids and everything around our Earth that is in our galaxy.We live in the Milky Way Galaxy.
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