Second Level Subjects



Astronomy is a natural science that studies celestial objects and phenomena. It applies mathematics, physics, and chemistry in an effort to explain the origin of those objects and phenomena and their evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, and comets; the phenomena also includes supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, all phenomena that originate outside Earth's atmosphere are within the purview of astronomy. A branch of astronomy called cosmology is the study of the Universe as a whole.

From Wikipedia

Organizations relating to Astronomy

International Association of Planetology / Est. 1968
International Star Registry / Est. 1979
Centre international de la planète Mars
Federation of Astronomical and Geophysical Data Analysis Services / Est. 1956
Special Committee for the International Years of the Quiet Sun / Est. 1962
Lola Solar Fund / Est. 1990
Solar Influences Data Analysis Centre / Est. 1981
Strasbourg Astronomical Data Centre / Est. 1972
European Union of Geosciences / Est. 1981
ORBIT Association / Est. 1999
Central American Association of Astronomers and Astrophysicists
International Commission on Astrophysics / Est. 1984
International Polar Orbiting Meteorological Satellites Group
Nordic Optical Telescope Scientific Association / Est. 1984
International Gravity and Geoid Commission
ESF Network on Converging Computing Methodologies in Astronomy
Joint Institute for VLBI in Europe / Est. 1993
Star of Africa Association / Est. 1989
International Dark-Sky Association / Est. 1988
Inter-Union Commission on Studies of the Moon
Red Latinoamericana de Cocinas y Hornos Solares / Est. 1994
Arab Union for Astronomy and Space Sciences / Est. 1998
Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, Including the Moon and other Celestial Bodies / Est. 1967
International Association of Geodesy / Est. 1862
Inter-American Geodetic Survey / Est. 1986

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