What was our universe before it was formed? it was just balls of matter , and energy. Until one day there was a massive explosion. That explosion blew up space like a giant balloon.

Scientist believe that the universe grew larger and larger, at the speed of light. Are scientist sure of this theory ? Yes , Astronomer Edwin Hubble was looking through his telescope one night , and saw galaxies, many of them, moving away from each other , at a very fast speed.

The universe is billions of years old , it was formed before any kind of life, like animals, and plants, and humans. There are still many things we don't know about the universe.

scientist have made observations that universe is expanding at a very fast rate. They believe sometime in the future when people look at the night sky, the only thing they will be able to see is the stars.

The energy that is moving the universe further and further apart , scientist are calling " the dark energy." This dark energy contains 68% of the matter and energy of the universe.

The universe is made up of stuff that cannot be seen. In fact, the stars, planets, and galaxies only make up 4% of the universe. The other 96% is made up of things we cannot see.

There is a theory that we live in a multiverse, meaning there is more than 1 universe out there that we may not know about.

Scientist think , shortly after the big bang, space expanded at different speeds and different places. They believe there are bubble universes that can function with there own laws of physics.