Sources
http://en.wikipedia.org/wiki/Neptune
http://www.universetoday.com/21581/neptune/
http://nineplanets.org/nept
http://www.8planets.co.uk/facts-about-neptune
http://www.shatters.net/celestia/gallery.html
http://space.about.com/od/voyagermissions/p/voyager2.htm
http://en.wikipedia.org/wiki/Johann_Gottfried_Galle
http://www.space.com/41-neptune-the-other-blue-planet-in-our-solar-system.html
http://astrobob.areavoices.com/tag/neptune/
http://www.bobthealien.co.uk/neptune.htm
http://solarsystem.nasa.gov/planets/profile.cfm?Object=Neptune&Display=Sats
http://www.spacestationinfo.com/physical-characteristics-neptune.htm
http://en.wikipedia.org/wiki/List_of_Solar_System_probes#Neptune_probes
http://www.universetoday.com/21581/neptune/
http://nineplanets.org/nept
http://www.8planets.co.uk/facts-about-neptune
http://www.shatters.net/celestia/gallery.html
http://space.about.com/od/voyagermissions/p/voyager2.htm
http://en.wikipedia.org/wiki/Johann_Gottfried_Galle
http://www.space.com/41-neptune-the-other-blue-planet-in-our-solar-system.html
http://astrobob.areavoices.com/tag/neptune/
http://www.bobthealien.co.uk/neptune.htm
http://solarsystem.nasa.gov/planets/profile.cfm?Object=Neptune&Display=Sats
http://www.spacestationinfo.com/physical-characteristics-neptune.htm
http://en.wikipedia.org/wiki/List_of_Solar_System_probes#Neptune_probes