How the Universe Was Formed

The ‘Big Bang Theory’ Is More than Just a TV Show

by Keyshawn Webster, age 13

Billions of years ago there was a boom. According to scientific theory, that boom was the start of Universe. This idea is called the “Big Bang Theory.”
Starting from a little unimaginably hot ball that exploded, within moments, the Universe burst into existence. Scientists are still unsure why the explosion occurred.
A lot of people wonder how old the Universe is. The Universe is somewhere between 13 and 15 billion years old. That’s a long way back in time, although some stars started forming 18 billion years ago.
The early Universe was a big surprise in a small package, holding the matter and the energy of the Universe today. Consisting of a dense mix of tiny particles and forces, the original Universe had one big superforce. But not for long. In just three trillionths of a trillionth of a trillionth of a second it split, creating the four fundamental forces: gravity, strong force, weak force, and electromagnetic force. About 300 million years after the Big Bang, galaxies and stars started to form.
People wonder how scientists know all of these facts. Well, they run tests. They don’t get every single detail exactly right, but they get a pretty good idea from all of the mathematical calculations. All of them are based on the laws of physics. They use huge machines called, colliders and particle accelerators to run experiments that recreate the early Universe.

[Sources: THE BIG BOOK OF KNOWLEDGE; Atlas of the Universe ]