It is distributed by a blast of energy that happened approximately 13.7 billion years ago. This sudden explosion is known as the Big Bang. This bang created matter. The energy from the explosion blasted the matter throughout the universe. This is explained by Hubble Theory. Edwin Hubble discovered that the universe was moving at an extraordinary pace. If you have any questions or concerns, don't hesitate to message me!
Here is a picture for a visual representation:
