Flammarion Camille . [1842-1925] Public astronomy translation from 7 French edition 1922 [pdf 245sc 245+2c. 21. Astronomy is studying the universe. The universe is the totality of everything that exists both in celestial space and on earth. The sun, the moon, and the stars are all part of the universe. And we cannot live among the greatness that surrounds us, we cannot contemplate its beauty without trying to understand and explain it to ourselves, otherwise we would not be different from an animal that devours grass and does not ask ourselves how this grass originated, how it grows and blooms. We are endowed with the mind to reflect and understand, and we are not content with what we see, but we also want to know.