The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe.
Synonyms:
  1. climax
  2. crisis
  3. critical juncture
  4. critical-point
  5. critical stage
  6. crossroads
  7. crucial moment
  8. crucial point
  9. decisive moment
  10. defining-moment
  11. emergency
  12. high-noon
  13. moment-of-truth
  14. pivotal point
  15. point-of-no-return
  16. turning point
  17. zero hour

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