Definition of closed universe in English:

closed universe

Syllabification: closed u·ni·verse

noun

Astronomy
The condition in which there is sufficient matter in the universe to halt the expansion driven by the Big Bang and cause eventual recollapse. The amount of visible matter is only a tenth of the total required for closure, but there may be large quantities of dark matter.
More example sentences
  • While a flat universe can extend indefinitely in all directions, the closed universe is finite.
  • Wait a few billion years for the newly closed universe to stop its expansion, collapse to a singularity, and - Presto! - give birth to a brand new, energy-rich universe, to do with as you please.
  • Assuming the Big Bang model, a closed universe would eventually collapse back onto itself, if there was enough dark matter.

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Word of the day grammarian
Pronunciation: grəˈmɛːrɪən
noun
a person who studies and writes about grammar