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| Neptune - Factfile |
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Neptune is the eighth planet from the sun and the fourth largest of the Solar System. |
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| Neptune was first discovered by Galle and d'Arrest on 1846. | |||||||
| Neptune has a planetary ring system. | |||||||
| Distance from Sun : | 30 astronomical units. | 4.5 billion km. | |||||
| Days to complete orbit (1 year) : 165 Earth Years | Days to complete rotation : 17 Earth Hours 52 minutes | ||||||
| Mass 17.2 Earth 1.0x1026 kg. | Diameter 3.9 Earth (49,500 km) | ||||||
| Temperature : -213ºC | |||||||
| Density : 1.77 g/cm3 | Satellites : 13 | ||||||
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