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Astronomy Magazine: http://www.astronomy.com/asy/default.aspx Astronomy Simulations: http://astro.unl.edu/ Astronomy Picture of the Day: http://antwrp.gsfc.nasa.gov/apod/astropix.html Heavens Above: http://www.heavens-above.com/ NASA Photojournal: http://photojournal.jpl.nasa.gov/ Science@NASA: http://science.nasa.gov/ Solar System Simulator: http://www.gunn.co.nz/astrotour/?data=tours/retrograde.xml Extra-Solar Planet Catalog: http://exoplanet.eu/catalog.php Space: http://www.space.com/ Sky and Telescope: http://www.skyandtelescope.com/ Sky-Watch: http://www.sky-watch.com/ National Geographic Solar System: http://science.nationalgeographic.com/science/space/solar-system Celestia (software): http://www.shatters.net/celestia/ Stellarium (software): http://www.stellarium.org/
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