The universe is the space where we live, and the original meaning of the word "Yu" means "up and down". The earth is our home; The earth is only the third planet in the solar system; The solar system only settled on one side of the huge spiral arm of the Milky Way; The universe of the Milky Way is the space where we live, and the original meaning of the word "Yu" is "up and down". The earth is our home; The earth is only the third planet in the solar system; The solar system only settled on one side of the huge spiral arm of the Milky Way; And the Milky Way, among all the galaxies in the universe, may be very inconspicuous ... All these make up our universe.

The universe is the home of all celestial bodies. The universe is also our time, and the original meaning of "Zhou" is "eternal". Because our universe does not always exist, it also has a process of birth and growth. Modern science found that our universe was formed about 20 billion years ago. In a spectacular big bang, our universe was born! This is the famous big bang theory. ) once the universe was formed, it has been in motion. Scientists found that the universe is expanding and the distance between stars is getting bigger and bigger.