expanding universe

noun Astronomy.
a concept or representation of the universe, based on the observed redshifts of distant galaxies, in which the galaxies are assumed to be receding from each other at a speed proportional to their separation as a result of the expansion of the universe.
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Expanding universe is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
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Example sentences
In a continuously expanding universe, its temperature would eventually reach
  absolute zero.
In the last decade astronomers discovered the expanding universe is also
  accelerating-expanding faster and faster.
They say an infinitely expanding universe cannot be so because the laws of
  physics do not work in an infinite cosmos.
One thing that astonishes me on an almost daily basis is the expanding universe
  of applications available in the cloud.
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