In Chapter 11 we have seen that, in the Einstein-de Sitter universe, the number of observable objects is limited even though the space is infinite Euclidean. This happens because at a certain “distance” the spectral ratio becomes infinite and the photons then no longer bring us energy. The observations reach to a “horizon” due to cosmological expansion.
KeywordsEvent Horizon Light Cone Spectral Ratio Cosmological Horizon Spherical Space
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