Why are there stars in the sky? How did the stars come from?

Stars, like the earth, are celestial bodies, which are the forms of existence and movement formed by the agglutination of matter after the Big Bang. Divided into planets and stars, the standard is to shine and not to shine.

The sun is a star, and all nine planets are planets. Planets can reflect the light of stars, so we can also see non-luminous planets, such as the moon. Some stars are arranged in a certain pattern, which we call constellations, such as Orion. Many stars and planets gather together and move regularly to form galaxies, such as the Milky Way.

Extended data:

Stars are divided into several categories: stars, planets, satellites, dwarf planets (this classification is only in the solar system) and small celestial bodies (asteroids, comets, etc.). ).

Stars are divided into stages: nova, main sequence star, red giant star, supernova (divided into the following categories)-1 white dwarf star, 2 neutron star; 3 Black hole.

Stars are divided into (brownish red) dwarfs, (blue, bluish white, yellow and red) giants and (blue and red) Supergiant star.

Stars are divided into O, B, A, F, G, K, M, R, N, S and other additional types according to their spectra.

Stars are divided into single star, double star, multi-star and cluster.

Other classifications of stars: invariant stars and variable stars.

Variable stars are divided into: Cepheid variable stars and eclipse variable stars.

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