|What is the Universe?||
The Universe is a big, open place. You are in the Universe. Things you can't see are in it, too. The biggest stars are in it. Even the smallest things on Earth are part of the Universe. We don't even know how big the Universe is!
Image to right: Amoebas live on Earth. They are in the Universe. They are very small. You can only see them with a microscope. Credit: NASA
Scientists study the Universe. They look at the stars and planets. They are called astronomers. They want to find out the size of the Universe. They don't know the answer, yet. But, they do know it is still growing.
The Universe started long ago. It is still getting bigger today. We do not know if it will stop. Will it change directions? Or, will it keep going forever?
Image to left: Our Sun and our solar system are in the Milky Way galaxy. It is part of the big Universe. Credit: NASA
Adapted from The Universe