Founded in 1968 by John Dobson, The Sidewalk Astronomers group (SWA) now has many members around the world. The primary goal of organisation is to give people a chance to observe celestial objects through good-sized telescopes and to provide information concerning all areas of Astronomy. SWA groups set up telescopes in busy places where people are likely to be passing by in order to share the wonders of the night sky to all those interested.

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Astronomers Without Borders is people meeting among the stars. It is only natural to do so. After all, we all share the same sky. The star-filled sky fascinates us all. People have gazed upward at it in wonder and awe for thousands of years. Regardless of earthly differences in culture, nationality or religion, the night sky is a common meeting ground for all of Earth's inhabitants. The boundaries we place between us vanish when we look skyward. Whoever, whatever or wherever we are, we all share the same sky.

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The arc of the Milky Way seen from a truly dark site is part of our planets cultural and natural heritage. It is now more urgent than ever to preserve & protect dark night skies in places such as urban cultural landscapes, national parks and sites connected with astronomical observations.

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IYA 2009 provides an excellent opportunity to engage the educational community in the excitement of astronomical discovery as a vehicle for improving the teaching of science in classrooms around the world. GTTP is embarking on a unique global effort to empower teachers by developing the Galileo Teacher Training Program

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The Solar Physics Task Group aims to communicate the link between the Sun and the rest of the Universe by providing a wide range of internet resources for children, educators and professional astronomers. The topics vary, from radio to high energy observatons, prehistoric and ancient knowledge, to cutting edge discoveries. There is something here for everyone

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ESO, the European Southern Observatory is the European Organisation for Astronomcial Research in the Southern Hemisphere. It builds and operates a suite of the world's most advanced ground-based astronomical telesocpes. Created in 1962, ESO provides state of the art research facilities to European astronomers and astrophysicists and is supported by Austria, Belgium, the Czech Republic, Denmark, Finland, Franch, Germany, Italy, the Netherlands, Portugal, Spain, Sweden, Switzerland and the United Kingdom.

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Yuri's Night is a worldwide annual celebration of humanity's achievements in space. Traditionally held on April 12th, the anniversary of Yuri Gagarin's first manned launch and the launch of the first space shuttle, Yuri's Night is being held from April 4-12 in 2009 to provide a wider variety of event opportunities. Over 50 countries hosted nearly 200 Yuri's Night events last year, including celebrations at the NASA Ames Research Center, Russia, and the South Pole. Yuri's Night is extremely proud to be working with the 100 Hours of Astronomy to increase participation in astronomical fields and awareness of astronomy and outer space.

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Galaxy Zoo Welcome to Galaxy Zoo, where you can help astronomers explore the Universe. The Galaxy Zoo files contain almost a quarter of a million galaxies which have been imaged with a camera attached to a robotic telescope (the Sloan Digital Sky Survey, no less). In order to understand how these galaxies and our own formed, we need your help to classify them according to their shapes, a task at which your brain is better than even the fastest computer. 100 Hours of Astronomy takes place this weekend. There are events taking place right across the globe, but here at Galaxy Zoo we have a challenge for you. Can we make 1 million classification clicks in the 100 hours? The race is on...

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CICLOPS: Cassini Imaging Central Laboratory For Operations,  is the official site of the Cassini Imaging Team and the offical source of high resolution images from Cassini.. CICLOPS celebrates Galileo and his work along with the 100 Hours of Astronomy global star party by making available some of its most memorable images and movies of Saturn, its satellites and rings. There are many more activities planned at CICLOPS which include playing Golf around Saturn and teeing-off from one of the moons. Check out the Space Art from many prominent astronomical artists, read 10 years' worth of the 'Captain's Log' written by Carolyn Porco, the Imaging Team Learder.  Visit the online Science Centre and become a member of the CICLOPS Alliance.

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