Understanding What the Big Bang Is
The Big Bang is the leading explanation for how the universe began. It describes a rapid expansion from an extremely hot, dense state around 13.8 billion years ago.
How the Big Bang Happened
The universe didn’t explode into space—it expanded from a tiny point of high energy. Space itself stretched, carrying matter and radiation outward.
Evidence for the Big Bang
Scientists support the Big Bang using clues like the expansion of galaxies, leftover radiation called the cosmic microwave background, and the abundance of light elements.
What Formed After the Big Bang
As the universe cooled, particles joined to form atoms. Over time, gravity pulled matter together, creating stars, galaxies, and eventually planets.
Why the Big Bang Matters
This model explains the structure of the universe, the formation of cosmic objects, and how everything we see today evolved from early conditions.
The Simple Takeaway
The Big Bang describes the universe expanding from a hot, dense beginning. It remains the most supported explanation for how everything started.