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The International Astronomical Union (IAU) was founded in 1919. Its mission is to promote and safeguard the science of astronomy in all its aspects through international cooperation.

This unique resource covers the entire field of astronomy and astrophysics and this online version includes the full text of over 2,750 articles, plus sophisticated search and retrieval functionality, links to the primary literature, and is frequently updated with new material. An active editorial team, headed by the Encyclopedia's editor-in-chief, Paul Murdin, oversees the continual commissioning, reviewing and loading of new and revised content.

The Sloan Digital Sky Survey (SDSS) is one of the most ambitious and influential surveys in the history of astronomy. Over eight years of operations (SDSS-I, 2000-2005; SDSS-II, 2005-2008), it obtained deep, multi-color images covering more than a quarter of the sky and created 3-dimensional maps containing more than 930,000 galaxies and more than 120,000 quasars. SDSS data have been released to the scientific community and the general public in annual increments, with the final public data release from SDSS-II scheduled for October 31, 2008. SDSS-III, a program of four new surveys using SDSS facilities, began observations in July 2008, and will continue through 2014.

The Sloan Digital Sky Survey (SDSS) is one of the most ambitious and influential surveys in the history of astronomy. Over eight years of operations (SDSS-I, 2000-2005; SDSS-II, 2005-2008), it obtained deep, multi-color images covering more than a quarter of the sky and created 3-dimensional maps containing more than 930,000 galaxies and more than 120,000 quasars. SDSS data have been released to the scientific community and the general public in annual increments, with the final public data release from SDSS-II scheduled for October 31, 2008. SDSS-III, a program of four new surveys using SDSS facilities, began observations in July 2008, and will continue through 2014.

"Deep Space Photos & Photography from Galactic Images ®. We display and sell high-quality astronomy pictures & prints developed at the Chumack Observatories. Images of stars, galaxy photos, sun, moon and solar system pictures, planet pictures, and constellation photos are in the Image Gallery and also available for purchase in the online store."

The Starry Messenger is Phase I of the Electronic History of Astronomy developed in the Whipple Museum of the History of Science and the Department of History and Philosophy of Science. This phase was directed by Dr Sachiko Kusukawa and Dr Liba Taub, and supported by funding from Trinity College, Cambridge. Dr David Chart was the Project Manager.

SpaceEngine - is a free space simulation software that lets you explore the universe in three dimensions, starting from planet Earth to the most distant galaxies. Areas of the known universe are represented using actual astronomical data, while regions uncharted by human astronomy are generated procedurally. Millions of galaxies, trillions of stars, countless planets!

Astronomy Picture of the Day  Index - Main Page

"Astronomy is a natural science that is the study of celestial objects (such as moons, planets, stars, nebulae, and galaxies), the physics, chemistry, and evolution of such objects, and phenomena that originate outside the atmosphere of Earth, including supernovae explosions, gamma ray bursts, and cosmic background radiation."

Get the latest outer space and science news, NASA information, watch space flight videos at Space.com. View exclusive solar system Images, latest astronomy news and more.

For 25 years, the ADC was a key center for published astronomy data, catalogs, and journal tables. The ADC made these data sets computer readable and developed new methods, tools, and techniques for their preparation and use.

Stuart Clark tells for the first time the full story behind Carrington's observations of a mysterious explosion on the surface of the Sun and how his brilliant insight-that the Sun's magnetism directly influences the Earth-helped to usher in the modern era of astronomy.

BBC Video

Over the weekend, Jupiter was apparently struck by an unknown object, probably a comet or an asteroid. The discovery was made by Anthony Wesley in Australia, an amateur astronomer well-known in both the amateur and professional astronomy communities.

Mobile Observatory is one of the most complete astronomy apps on the Android market and the perfect tool for anybody interested in the sky's wonders, from the occasional sky gazer to the passionate amateur astronomer.

Universe Visualized A compilation from numerous sources of science visualizations, animations and videos related to astronomy, physics, meteorology and climate change. All sources are cited at the bottom of each video's text description.

interactive Astronomy Software for everyone