The Big Bang: A Beginnerâs Guide to the Start of the Universe
https://thecosmicequation.com/the-big-bang-a-beginners-guide-to-the-start-of-the-universe/
Every story has a beginning. Let me tell you the story of our universe.
Once upon a time⊠there was nothing. Absolutely nothing.
But not the kind of nothing we can imagineânot empty space or a dark void. There was no space at all. And yet, in that unfathomable absence, there existed an impossibly small, unimaginably dense point containing everything.
Then, it began to expand, not into space, but as space itself. This moment marks what we have now come to understand as the beginning of the universe.
What Iâve just described is, scientifically speaking, known as the Big Bang theory. This has come to be one of the most important ideas in modern physicsâa model explaining the evolution of our universe from a hot, dense state into the vast cosmos we see today. Not only that, it serves as the foundation of cosmology, influencing our understanding of matter and time itself.
At its heart, the Big Bang theory says that around 13.8 billion years ago, the universe began as a singularity, i.e. an infinitely small and dense point, which then rapidly expanded. This wasnât an explosion in space; it was the expansion of state itself.
As the universe grew, it cooled. Energy condensed into particles, which formed atoms, and then stars and galaxiesâand, eventually, planets, life, and minds curious enough to ask:Â How did it all begin?
In this post, weâll explore what the Big Bang theory really says, the evidence supporting it, and the key milestones in the early life of our universe...