When we look at the night sky, we see a thousands of stars. in ancient times also imagined group of stars that form pictures of animals, objects and people. these imaginary group of stars are called constellations. every time there are star formed and forming a group of star, but it is not mainly discovered because it is very far away from earth, but the estimation of early Babylonians and Greek civilizations until now there are about 88 groupings of bright star that appear in the sky.
some constellation are; Andromeda, Canis major, Canis minor, Lyra, Perseus, Ursa major, Ursa minor, Cassiopeia, Cepheus, Cetus, Crux,Cygnus, Draco, Equuleus, Eridanus, Hercules, Leo minor and others.