Neptune

A picture of Neptune from space.

Discovered: It was discovered in 1846 by John Couch Adams and Urbain Le Verrier.

Named after: It was named after the Roman god Neptune god of the sea.

Temperature: 73 K

Diameter: 49,500 km

Made of: 80% hydrogen,19% helium, methane, ammonia, and water ice

Can people live on Neptune?: No. It is so,so,so cold on Neptune that people can't live on this planet.