The universe is all that surrounds us of stars, galaxies, living organisms, asteroids, comets and many things, and it is a very wide space.
Many philosophers in the past tried to explain the universe and what the universe is within several theories, so we find that there are many opinions regarding determining the nature of the universe.
According to the scientific description of many scientists who have tried to explain the phenomenon of the universe, the universe is a vast space that includes many stars and planets.
The Milky Way, which includes the sun and the solar system, that is, the planets, especially the Earth, is one of the galaxies of the universe.
- The beginning of the universe:
Opinions and conversations regarding the beginning of the universe differ, but some philosophical theories say that Albert Einstein solved the general theory of relativity, which asserts that the universe is expanding.
Then came the scientist Alexander Friedman to prove the validity of Einstein’s theory that the universe is expanding and not static.
- cosmic distances:
Astronomers and the universe developed the term light year to measure the distance between galaxies and planets.
A light year is the distance traveled by light rays in a year and it is 9400 billion km.
Thus, it can be said that the distance between the Earth and the Sun is regarding 150 million km, and thus, the rays take eight minutes to reach the Earth.
- The universe and cosmic space:-
The universe is everything that surrounds us and everything that is visible to us, while the cosmic space is everything in the universe, whether it is visible to us or invisible.
Here we have finished talking regarding the universe with some important information that is useful to most students.
