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Sky & Telescope ~ Sky & Telescope is a monthly magazine for the amateur astronomer. It features detailed discussions of current discoveries, amateur and professional photography, plus tables and charts of upcoming celestial events. Much of this is freely available from their website, so it is hard to imagine why I have not recommended that before.
Skymania ~ British astronomy site in blog format, presenting the latest celestial happenings and news from space in a way that almost everyone can understand and get enthusiastic over. In particular check out their guide to Mars, for the latest on the NASA Phoenix mission to the red planet, now extended through September 2008.
Skywise Unlimited ~ Another site becoming twilighted in the march towards the model of the Internet as a store front, that is wholly accessible on your underpowered mobile device. There is much to recommend about this offering, especially the section on North American Indian full moons, looking at twenty-nine different tribes from the peaceful Hopi, through the feared Comanche.
Solar & Heliospheric Observatory ~ SOHO, the Solar & Heliospheric Observatory, is a joint venture involving both the National Aeronautics and Space Administration (NASA) and the European Space Agency (ESA). It’s all a bit low-key compared with what we’re used to, but there is plenty of interesting material and some great imagery, you’ll discover by following lots of links.
Solar System Exploration ~ An awesome site from NASA that does just what it says on the tin. If you want to know the latest and most comprehensive information about the planets and their moons, breaking news, recent discoveries, related events and planned missions to find out more, you’ll have problems getting this kind of detail anywhere else…
Solar System Scale Model ~ Stunning example demonstrating that you don’t need bleeding edge technology to create a lasting impact, when it comes down to the strength of your design concept in the first place. As the title suggests this webpage is a scale model of our solar system, scroll sideways for an unforgettable introduction to the vastness of space.
Solar System Simulator ~ For those who can let their imagination wander to the furthest reaches of the multiverse, this site from NASA’s Jet Propulsion Laboratory is a dream come true. You can select a view of any planet from almost any other location in the solar system. There are some great space landscapes too.
Space & Astronomy Stamps ~ I don’t actually collect stamps you’ll understand, having not quite reached that point in my life just yet, but I was impressed by the comprehensive range of this site, the clean design, enormous catalogue of stamps from all over the world and the astronomical theme, with astrology featuring too if you look for long enough…
Space Audio ~ At first, I didn’t rate this site much. There are few clues to its provenance, apart from a bald statement that these are sounds collected by (ahem) University of Iowa instruments aboard assorted exotic spacecraft. But listen to the samples and follow the links to their YouTube channel. It’s like Tangerine Dream meets Dr. Didg, if you still remember either of these acts…
Space Calendar (JPL) ~ To be kept informed about the latest happenings in space, this is a primary source of reference. Compiled and maintained by Ron Baalke of NASA’s Jet Propulsion Laboratory, the focus is on observation and education, rather than assigning any meaning to these events. A number involve asteroids and comets, reflecting current interest in these bodies.
Space.Com ~ The online home of Space Holdings, publishers of Starry Night™ astronomy software. With a multimedia focus, this site features all the latest developments from the world of astronomy.  At the time of writing there is a special emphasis on the Leonid meteor shower, set to peak on November 19 this year.
Spacehack ~ Spacehack is a directory of the ways you can get involved in space exploration for yourself. Some of these are only for engineers or software developers, but with others like the great worldwide star count, mapping the surface of Mars and soon the search for new planets, you can definitely help out from your desk or backyard.
SpaceRip ~ These guys have their own website, but their YouTube channel is better as it showcases their end product. If you are drawn to space and astronomy videos that use footage and photography from the world’s most advanced satellites and telescopes, or enjoy it when that is interpreted with artistic flair and great technique, you’ll simply love the content here.
Space Wallpaper ~ Short of a glorious representation of your own birthchart, great astrological pictures for your desktop background are hard to find. It’s tempting to save random NASA imagery instead and use that, but going to this website and choosing from their specially purposed photographs is better, with a more stunning result in the end…
Space Weather ~ The solar wind is a stream of charged particles released from the upper atmosphere of the Sun. Fluctuations in its speed, strength, direction and magnetic field impact on our environment. Described as space weather, these phenomena are significant. Radio and satellite communications, global positioning systems and even our climate are all affected…
SpaceWeather.com ~ A detailed and proficient astronomy site that is both well presented and easily accessible. Look no further for the latest news regarding the Sun-Earth environment, including such gems as the current speed of the solar wind, condition of the sunspot cycle and what to look for in the night sky at the moment.
StarDate Online ~ Another great site for all matters astronomical, this time provided by the public education and outreach arm of the University of Texas McDonald Observatory. The site provides a useful astronomical diary, together with some comprehensive and easily accessible information on the planets and the stars…