Neptuni ni sayari ya nane kutoka Jua letu. Sayari hii ilipewa jina la mungu wa bahari anayeitwa Neptuni (Kiing: Neptune; Kilat: Neptunus).
| Amonia | Ammonia |
| Angahewa | Atmosphere |
| Barafu ya methani | Methane ice |
| Chuma-nikeli | Nickel-iron |
| Doa kubwa jeusi | The Great Dark Spot |
| Gesi ya methani | Methane gas |
| Heli | Helium |
| Hidrojeni | Hydrogen |
| Kiini cha mwamba | Rocky core |
| Koti | Mantle |
| Maji | Water |
| Ncha ya kaskazini | North pole |
| Ncha ya kusini | South pole |
| Peteo | Ring |
| Silikati | Silicate |

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