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http://www.stsci.edu/resources

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http://www.refdesk.com/space.html

http://www.astro.psu.edu/users/stark/links/viewing/EMandP.html

http://www.solarviews.com/eng/homepage.htm

http://www.astronomytoday.com/

http://www.astronomy.com/asy/default.aspx

http://web.mit.edu/newsoffice/2009/backward-planet.html

http://cosmiclog.msnbc.msn.com/archive/2009/12/10/2148709.aspx

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http://www.space.com/planets/

http://www.kidsastronomy.com/solar_system.htm

http://aas.org/education/general.php

http://lasp.colorado.edu/education/outerplanets/solsys_planets.php

http://www.johnstonsarchive.net/astro/

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http://www.nasa.gov/worldbook/planet_worldbook_update.html

http://nineplanets.org/

http://www.planetary.org/home/

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http://www.enchantedlearning.com/subjects/astronomy/solarsystem/where.shtml

http://www.aavso.org/education/vsa/

http://stardate.org/

http://imagine.gsfc.nasa.gov/docs/science/know_l1/black_holes.html

http://www.worldwidetelescope.org/Home.aspx