Journey Into Space: Gravity, Orbits, and Collisions
Space Astronomy and Space
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The composition of Earth

Diameter: 7,900 miles across
Location: 3rd planet from Sun
Distance from Sun: About 93 million miles
Average Surface Temperature: 59 Fahrenheit
Number of Moons: 1
Orbital Period: 1 year
Characteristics: This is the only known planet that supports living organisms, water, and an oxygen-rich atmosphere.
Identity in Mythology: Gaea, the Greek Earth goddess and Terra Mater, the Roman mother Earth

(Image: Grolier Interactive)
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