11. Basic Facts about Neptune

12. Diameter: 49,500 km or 30,760 miles Name History: Neptune is the god of sea in the Roman Mythology, and is associated with Greek Sea God, Poseidon Discoverer: Urbain Le Verrier, John Couch Adams and Johann Galle Discovery Date: 23 rd of September 1846 Distance from the sun: 4,500 million km or 2,800 million miles Cloud-top temperature: -220°C or -364°F Length of Day: Around 16 hours Length of Year: Around 165 Earth Years Number of Moons: 13 Moons: (Inner Moon) Larissa, Proteus, (Outer Moon) Nereid, S/2002 N1, (Major Moon) Triton and others Biggest Moon: Triton Color: Blue Mass: 1.0243×10 26 kg or 17.147 size of the Earth Property: Gas, Ice Ice: Ammonia (NH 3 ), Water (H 2 O), Ammonium Hydrosulfide (NH 4 SH), Methane (CH 4 ) Gas (Atmosphere): 80±3.2% Hydrogen (H 2 ), 19±3.2% Helium (He), 1.5±0.5% Methane (CH 4 ), 0.019% Hydrogen Deuteride (HD), 0.00015% Ethane (C 2 H 6 ) Gravity: 10.71 m/sec 2 or 35.14 ft/sec 2 Gravity at cloud tops (compared to Earth) (Earth: 1): 1.13 Features: The Great Dark Spot Rings: 6

13. Bibliography: http://www.brainpop.com/science/space/nep tune/ http://www.brainpop.com/science/space/nep tune/ http://en.wikipedia.org/wiki/Neptune