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Solving the Century Old Puzzle of Our Galaxy's Neighborhood

Nearly a century after Edwin Hubble discovered the universe's expansion, astronomers have finally explained the nagging mystery of why most nearby galaxies rush away from us as if the Milky Way's gravity doesn't exist? The answer lies in a vast, flat sheet of dark matter stretching tens of millions of light years around us, with empty voids above and below that make the expansion appear smoother than it should.

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