Was there a 'before' to the Big Bang?
In short: For decades, scientists treated the Big Bang as the absolute starting line of existence. But modern physics suggests that asking what happened before the beginning might not be as impossible as it sounds. We are moving from a universe with a hard start to one that might be eternal.
The conventional narrative suggests that our universe began 13.8 billion years ago. If we rewind the expansion of the cosmos, it appears to shrink back toward a single point of infinite density known as a singularity. However, according to Albert Einstein’s general theory of relativity, space and time are not independent entities but are woven into a fluid continuum called space-time. Because of this, the singularity represents a rupture in our current understanding—a point where our math breaks down—rather than a definitive 'beginning' of time itself.
Recent shifts in theoretical physics, particularly the rise of string theory, have sparked a debate about what preceded this rupture. Some cosmologists now entertain the 'Big Bounce' theory, which proposes that our universe resulted from the contraction and subsequent rebound of a previous universe. Others, like Roger Penrose, have suggested a more radical 'rescaling' of space-time, where new universes emerge from older ones without a contraction phase. In these models, time is not a linear path with a start date but an eternal progression.
Alternative theories offer even more exotic possibilities. The Big Bang is when time, previously a standard dimension similar to space, supposedly became 'derailed' according to James Hartle and Stephen Hawking. Another hypothesis posits that space-time is composed of particle-like pieces that underwent a phase transition, much like steam condensing into liquid water, to form the continuous fabric we see today. These ideas challenge the notion of a unique origin, suggesting that our existence might be part of a much larger, perhaps infinite, cosmic cycle.
This scientific inquiry mirrors ancient philosophical struggles. Aristotle argued that since nothing comes from nothing, the universe must have always existed. Conversely, Christian theologians like Augustine argued that time was created by God, meaning there was no 'before' because time itself didn't exist yet. Today, the quest to find the 'first stars' and the origins of elements continues to bridge these ancient questions with modern exploration.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: The Beginning of Time | Your Cosmos | BBC Studios
- Also: The Myth Of The Beginning Of Time
- Also: When did time begin? Hint: It wasn’t at the big bang | New Scientist
To cite this card, link to https://intellectplus.co.uk/app/nature-the-beginning-of-time-your-cosmos-bbc-studios.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Nature · Latest · A–Z · All topics
