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The Cosmic Apocalypse

Before observations of dark energy, cosmologists considered two scenarios for the future of the Universe. If the mass density of the Universe were greater than the critical density, then the Universe would reach a maximum size and then begin to collapse. It would become denser and hotter again, ending with a state that was similar to that in which it started — a Big Crunch. Alternatively, if the density in the Universe were equal or below the critical density, the expansion would slow down, but never stop. Star formation would cease as all the interstellar gas in each galaxy is consumed, stars would burn out leaving white dwarfs, neutron stars and black holes. Very gradually, collisions between these would result in mass accumulating into larger and larger black holes. The average temperature of the Universe would be an asymptomatic approach to absolute zero/ -273,15C – a Big Freeze. Moreover, if the proton were unstable, then baryonic matter would disappear, leaving only radiation and black holes. Eventually, black holes would evaporate emitting Hawking radiation. The entropy of the Universe would increase to the point where no organized form of energy could be extracted from it, a scenario known as heat death.
Modern observations of accelerated expansion imply that more and more of the currently visible universe will pass beyond our event horizon and out of contact with us. The eventual result is not known, universe contains dark energy in the form of a cosmological constant. This theory suggests that only gravitationally bound systems, such as galaxies would remain together and they too would be subject of heat death, as the universe expands and cools.
Other explanations of dark energy – so-called phantom energy theories – suggest that ultimately galaxy clusters, stars, planets, atoms, nuclei and matter itself will be torn apart by the ever-increasing expansion in a so-called Big Rip.


2 comments to The Cosmic Apocalypse

  • Tracy

    No No No Light cannot know Darkness. Negative and Positive protons will perhaps be ultimatly separated. Two different universes? We are not alone and can only acknowledge a fraction of whats out their. For those who seek will find the answers from our creator.

  • Gene

    Good luck with your "creator" idea…

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