Journey Into Space: Gravity, Orbits, and Collisions
Space Astronomy and Space
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Diameter: 32,000 miles across
Location: 7th planet from Sun
Distance from Sun: About 1.8 billion miles
First Observed: 1781
Cloud Top Temperature: -320 Fahrenheit
Number of Moons: 27
Orbital Period: 84 years
Characteristics: Its atmosphere is made up of methane, helium, and hydrogen gases. Clouds of methane ice crystals create its blue-green appearance and it has a core of silicate rock.
Identity in Mythology: Uranus, the Greek god of the heavens

(Image: Grolier Interactive)
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