Cosmology is a part of space science worried about the investigations of the source and development of the universe, from the Big Bang to today and on into what's to come. It is the logical investigation of the inception, development, and inevitable destiny of the universe. Physical cosmology is the logical investigation of the universe's root, its huge scope structures and elements, and its definitive destiny, just as the laws of science that oversee these zones.

The term cosmology was first utilized in English in 1656 in Thomas Blount's Glossographia, and in 1731 taken up in Latin by German rationalist Christian Wolff, in Cosmologia Generalis.

Strict or fanciful cosmology is an assemblage of convictions dependent on legendary, strict, and elusive writing and conventions of creation fantasies and eschatology.

Physical cosmology is concentrated by researchers, for example, stargazers and physicists, just as logicians, for example, metaphysicians, scholars of material science, and rationalists of reality. Due to this common extension with theory, hypotheses in physical cosmology may incorporate both logical and non-logical recommendations, and may rely on suspicions that can't be tried. Cosmology contrasts from space science in that the previous is worried about the Universe in general while the last arrangements with individual heavenly articles. Present day physical cosmology is ruled by the Big Bang hypothesis, which endeavors to unite observational space science and molecule material science; all the more explicitly, a standard definition of the Big Bang with dim issue and dim vitality, known as the Lambda-CDM model.

Hypothetical astrophysicist David N. Spergel has portrayed cosmology as a "recorded science" since "when we watch out in space, we think back in time" because of the limited idea of the speed of light.