Neptune was named by the astronomer who discovered the planet, Urbain Le Verrier. It is named after the Roman god of the sea, which was in keeping with the theme of naming the planets after gods from Greek and Roman mythology. Other proposed names included Janus, Oceanus and Le Verrier.
Neptune was discovered by Le Verrier in 1846. The earliest observation of the planet was recorded in the early 17th century by Galileo, who mistook it for a fixed star. It is the farthest planet from the sun and the fourth largest planet by diameter. It is the most dense planet, with a mass 17 times that of Earth.Learn More
Uranus is composed largely of hydrogen and helium like the other gas giants. It also has water ice, methane ice and ammonia ice. There are also tiny amounts of carbon monoxide, carbon dioxide and hydrocarbons such as ethane, acetylene, diacetylene and methylacetylene.Full Answer >
The word "planet" in Greek means "wanderer." Planets were thought to be moving against the still background of stars. The planets move, or revolve, around the sun in relatively fixed orbits.Full Answer >
The interiors of the Jovian planets, also known as gas giants, are different because of their sizes. Jupiter and Saturn, the largest of the four Jovian planets, are massive enough to compress materials into a rocky core. Uranus and Neptune exert less pressure, which causes their cores to be in an icy, liquid state.Full Answer >
Venus does not have any rings. The planet does not have rings because the temperature on Venus is too high for their formation. Rings are associated with the outer planets of Jupiter, Saturn, Neptune and UranusFull Answer >