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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