Origin and Evolution of the Universe. Группа авторов

      Assuming the cosmic acceleration continues as it will according to most theories of Dark Energy, our observable portion of the Universe (within our horizon) will eventually encompass fewer and fewer galaxies. At some point in the very distant future (hundreds of billions of years from now), there may be no visible galaxies beyond our local group. Any newly born civilization in that era would face a far harder challenge than we do in figuring out the cosmology explained in this chapter. We may therefore be fortunate to live in an earlier part of the Universe’s history when there is still ample observable evidence to show us how we got here.

       Conclusion

      The conclusion of this chapter is merely the introduction to the next act, the origin of galaxies, described in Chapter 2. The conditions necessary to form galaxies were established during an inflationary epoch that occurred earlier than 10⁻¹² seconds after the Big Bang. Because inflation makes any preexisting structures in the Universe much too large to be observable, the temperature fluctuations observed by COBE, which were created during inflation, are the oldest structures we can ever observe.

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