<iframe title="Brian Greene - What Was There Before The Big Bang?" src="https://www.youtube.com/embed/PXixKGcctms?feature=oembed" height="113" width="200" style="aspect-ratio: 1.76991 / 1; width: 100%; height: 100%;" allowfullscreen="" allow="fullscreen"></iframe> **Duration:** 10:7 **Language:** **Complexity:** **Topics:** # šŸ“’ Personal Notes --- date: 2024-03-20 --- # YouTube ![]() ## Description: -> [Youtube video Link](https://www.youtube.com/embed/PXixKGcctms) ## Summary: The video delves into the Big Bang theory, explaining the origins and early evolution of the universe, as well as the limitations of current scientific knowledge and theories about what predated the Big Bang or the nature of time before it. - The Big Bang theory describes the universe's expansion from an extremely hot and dense state but doesn't explain the cause of the universe or what preceded it. - Various theories suggest the Big Bang could be one of many such events in a larger cosmic landscape or part of a cycle of expanding and contracting universes. - Key concepts like the Planck Epoch, repulsive gravity, and the potential for quantum fluctuations are explored as explanations for the universe's origins. **Topics:** - Cosmology - Physics