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Great Attractor: the source of a huge gravitational field that attracts our Milky Way as well as all other galaxies within several hundred million light-years. Astronomers think that the Great Attractor is a galaxy super cluster with a concentration of mass roughly equivalent to 10 quadrillion times the mass of the sun. As seen by us, it is located right in the direction of the Milky Way's center; since it is obstructed by the concentration of dust and stars in that region, it is hard to observe.
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