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King's Park Primary School
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2010
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October
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3 comments:
Neptune is the eighth and farthest planet from the Sun in our Solar System. Named for the Roman god of the sea, it is the fourth-largest planet by diameter and the third-largest by mass. Neptune is 17 times the mass of Earth and is slightly more massive than its near-twin Uranus, which is 15 Earth masses and not as dense.[12] On average, Neptune orbits the Sun at a distance of 30.1 AU, approximately 30 times the Earth-Sun distance. Its astronomical symbol is , a stylized version of the god Neptune's trident.
At high altitudes, Neptune's atmosphere is 80% hydrogen and 19% helium.[17] A trace amount of methane is also present.
As with Uranus, this absorption of red light by the atmospheric methane is part of what gives Neptune its blue hue,[51] although Neptune's vivid azure differs from Uranus's milder aquamarine.
Since Neptune's atmospheric methane content is similar to that of Uranus, some unknown atmospheric constituent is thought to contribute to Neptune's colour
Janet said.......
Neptune is one of the two planets that cannot be seen without a telescope. The other is Pluto. Neptune is about 30 times as far from the sun as the earth. Scientists believe that Neptune is made up chiefly of hydrogen, helium, water and silcates, silcates are the minerals that make up most of the Earths rocky crust, though Neptune does not have a solid surface like earth.
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