expanding universe

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expand′ing u′niverse

a model of the universe, based on observed redshifts of distant galaxies, in which the galaxies are receding from each other at a speed proportional to their separation.
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ex·pand·ing universe

A model of the universe in which the volume of the universe is expanding. It is based on the idea that the red shift in light from distant galaxies is evidence that all galaxies are moving away from one another. See Notes at big bang, Doppler effect.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
The former is one possible fate for the universe in which the metric expansion of space eventually reverses itself through lack of gravity so that the universe recollapses ultimately ending in a black hole singularity from which re-expansion is presumably impossible.