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Hubble flowSee Hubble's law.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
Hubble flow[′həb·əl ‚flō]
The mutual recession of celestial objects from each other by virtue of the cosmological expansion of the universe.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.