Journey Into Space: Gravity, Orbits, and Collisions
Space Astronomy and Space
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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)
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