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→Physical characteristics: Spelling, grammar, and general cleanup, typos fixed: It’s → It's, planet’s → planet's (2)
== Physical characteristics ==
== Physical characteristics ==
Neptune is 24,764 km (15,388 miles) in radius. It’s atmosphere is about 80% [[hydrogen]], 19% [[helium]], and 1.5% [[methane]]. Despite being the farthest planet from the sun, Neptune radiates more than twice as much heat as it receives from the Sun. The winds of Neptune are the strongest in the [[solar system]], at 2000 km/hr.<ref name=Arnett/><ref name=Hamilton>Hamilton, Calvin J. "[http://www.solarviews.com/eng/neptune.htm Entry for Neptune]." ''Views of the Solar System'', 2001. Accessed May 7, 2008.</ref> The source of the energy that fuels these winds remains unsettled.<ref name=Arnett/>
Neptune is 24,764 km (15,388 miles) in radius. Its atmosphere is about 80% [[hydrogen]], 19% [[helium]], and 1.5% [[methane]]. Despite being the farthest planet from the sun, Neptune radiates more than twice as much heat as it receives from the Sun. The winds of Neptune are the strongest in the [[solar system]], at 2000 km/hr.<ref name=Arnett/><ref name=Hamilton>Hamilton, Calvin J. "[http://www.solarviews.com/eng/neptune.htm Entry for Neptune]." ''Views of the Solar System'', 2001. Accessed May 7, 2008.</ref> The source of the energy that fuels these winds remains unsettled.<ref name=Arnett/>
The planet’s most prominent feature was its Great Dark Spot, a storm similar to [[Jupiter| Jupiter’s]] Great Red Spot. In 1989, when Voyager 2 revealed it, it moved westward at 300 km/s.<ref name=Arnett/><ref name=Smith/> Voyager 2 also revealed an irregular, eastward-moving cloud, called the "scooter," evidently moving with the planet's rotation. Most astronomers believe that this is a plume rising from a deeper deck of clouds.<ref name=Arnett/><ref name=Hamilton/>
The planet's most prominent feature was its Great Dark Spot, a storm similar to [[Jupiter| Jupiter's]] Great Red Spot. In 1989, when Voyager 2 revealed it, it moved westward at 300 km/s.<ref name=Arnett/><ref name=Smith/> Voyager 2 also revealed an irregular, eastward-moving cloud, called the "scooter," evidently moving with the planet's rotation. Most astronomers believe that this is a plume rising from a deeper deck of clouds.<ref name=Arnett/><ref name=Hamilton/>
When the [[Hubble Space Telescope]] photographed Neptune in 1994, the Great Dark Spot had disappeared. Another great storm of comparable size formed a few months later.<ref name=Arnett/>
When the [[Hubble Space Telescope]] photographed Neptune in 1994, the Great Dark Spot had disappeared. Another great storm of comparable size formed a few months later.<ref name=Arnett/>