Did time itself begin at the moment of the Big Bang?
In short: The origin of our universe remains one of science's greatest mysteries. This video explores leading cosmological theories regarding what—if anything—existed before the hot, expanding universe we inhabit today.
The video examines several speculative models in theoretical cosmology to determine if reality had a prior state. These include 'cyclic universes' and the 'Big Bounce,' which suggest our universe is part of an endless sequence of cosmic phases that collapse and expand repeatedly.
Other explored concepts include eternal inflation, which creates new regions of space, and the Emergent Universe model. Perhaps most provocatively, some theories argue there was no 'before' because time itself may have originated at the Big Bang.
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Sources
- Summary by Intellect · source: Every Theory Before The Big Bang Explained in 9 Minutes
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