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A dark galaxy is a hypothetical galaxy composed of dark matter. Dark galaxies receive their name because they have no detectable stars and are theoretically invisible. They are not able to generate stars because their density of gas is too low. Some scientists have theorized that dark galaxies were actually common in the early stages of the universe. Originally, these galaxies had trouble creating stars because of their density, but as time progressed galaxies began to create stars. An influential community of scientists conjecture the existence of dark galaxies to support theories based on other well-studied celestial bodies. There is experimental evidence to support the existence of dark galaxies, although scientists have no conclusive evidence and continue their research. Scientists have proposed a means to track down the dark dwarf galaxies that should be orbiting the Milky Way, saying they have now found evidence of one.