The Universe is so vast that it contains everything. The universe consists of all the galaxies, the stars, the Sun, the Earth and everything that exists in limitless space. The size of the Universe is beyond human imagination. It is difficult to describe the Universe exactly, because no one knows what it actually consists of.
There may be many distant worlds in the Universe about which we know nothing. Even every empty space is a part of the universe, and so are matter, time, and energy. It is impossible to imagine the nature and vastness of our Universe.