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Virtual planetarium customizable by location (latitude and longitude) and time of day.
http://www.neave.com/planetarium/
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A giant image of 88 objects in our solar system, including 11 planets and 21 moons.
http://kokogiak.com/solarsystembodieslargerthan200miles.html
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Galaxy Zoo - the project which harnesses the power of the internet - and your brain - to classify a million galaxies
http://www.galaxyzoo.org/
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Myths and misconceptions. Includes an introduction, brief biography, and discussion board.
http://www.badastronomy.com/