Astronomy is the scientific study of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the cosmic background radiation). It is concerned with the evolution, physics,...
Astrology (from Greek: ἄστρον (astron), "star", and λόγος (logos), "theory", "study": lit. study of the stars) is a group of systems, traditions, and beliefs in which knowledge of the relative positions of celestial bodies and related...
Astrobiology (from Greek: ἀστρο, astro, "constellation"; βίος, bios, "life"; and λόγος, logos, "knowledge") is the interdisciplinary study of life in space, combining aspects of astronomy, biology and geology.[2] It is focused primarily...
Astrophysics is the branch of astronomy that deals with the physics of the universe, including the physical properties (luminosity, density, temperature, and chemical composition) of celestial objects such as stars, galaxies, and the interstellar...
Astrometry is the branch of astronomy that relates to precise measurements and explanations of the positions and movements of stars and other celestial bodies. Although once thought of as an esoteric field with little useful application for the future,...
Astrochemistry is the study of the chemical elements found in outer space, generally on larger scales than the Solar System, particularly in molecular gas clouds, and the study of their formation, interaction and destruction. As such, it represents an...
