Waktu: Béda antarrépisi

=== Speculative physics beyond the Big Bang ===

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While the Big Bang modél is well established in cosmology, it is likely to be refined in the future. Little is known about the éarliest moments of the universe's history. The [[Penrose-Hawking singularity theorems]] require the existence of a singularity at the beginning of cosmic time. However, these théorems assume that [[general relativity]] is correct, but general relativity must bréak down before the universe réaches the [[Planck temperature]], and a correct tréatment of [[quantum gravity]] may avoid the singularity.<ref>{{cite book | author=Hawking, Stephen; and Ellis, G. F. R. | title = The Large Scale Structure of Space-Time | location= Cambridge | publisher=Cambridge University Press | year=1973 |id = ISBN 0-521-09906-4}}</ref>