Who am I? I was 1st observed by Galle and d'Arrest in 1846.|Mercury|Jupiter|Saturn|Uranus|Mars|T=Neptune
I was visited by only 2 spacecraft.|Mercury|Jupiter|Saturn|Uranus|Mars|T=Neptune
I am the 8th planet from the Sun and the 4th largest.|Mercury|Jupiter|Saturn|Uranus|Mars|T=Neptune
In Roman mythology I was known as the god of the sea.|Mercury|Jupiter|Saturn|Uranus|Mars|T=Neptune
