What is the Big Bang?

Welcome! I'd love to help you explore the spectacular history of our universe.

Before we dive into the deep cosmic waters of the Big Bang, I'd love to know a little bit about your background in science or astronomy. Are you a complete beginner to this, or do you already have some physics or astronomy knowledge under your belt?

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The Ultimate Origin Story

At its heart, the Big Bang theory is the leading scientific explanation for how our entire universe came to exist. It is not actually an explosion in space, but rather the rapid expansion of space itself. Astronomers have traced this cosmic journey back to a starting point approximately 13.8 billion years ago. Before this moment, everything that would ever exist—every atom, star, and galaxy—was packed into an infinitely hot, infinitely dense point called a .

A static, geometrically precise visualization of the metric expansion of space, showing identical galaxy markers on concentric snapshot rings that expand outward from a central point.

This visual helps illustrate that the Big Bang was the birth of space and time themselves. Since that initial moment, the universe has been stretching and cooling down, allowing energy to condense into the matter we see today.

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To bring it back to our cosmic timeline, we just left off at the very beginning of the universe: the . Let's look at what happened next. About 13.8 billion years ago, this tiny, hot point underwent a mind-bogglingly fast stretch called . This wasn't an explosion of material scattering into empty space; space itself was stretching open everywhere at once, far faster than the speed of light.