The motion of the Local Group is due to the gravitational pull of nearby concentrations of galaxies and clusters — superclusters — but the push from a giant underdense region may be just as important.
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Hudson, M. Large-scale structure: Going with the flow. Nat Astron 1, 0040 (2017). https://doi.org/10.1038/s41550-017-0040
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DOI: https://doi.org/10.1038/s41550-017-0040
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