Diameter: 31,000 miles across
Location: 8th planet from Sun
Distance from Sun: About 2.8 billion miles
Cloud Top Temperature: -300° Fahrenheit
Number of Moons: 13
Orbital Period 165 years
Characteristics: First observed in 1846, this gaseous, blue planet has storms with winds reaching 400 miles per hour.
Identity in Mythology: Neptune, the Roman god of the sea

(Image: Grolier Interactive)