Celestial Buddies – Earth
I am a good natured, true blue friend!
-Age: about 4.53 Billion years
-Weight: 1.317x 1025 pounds
-Diameter: 7900 miles
-Average surface temperature: 60 degrees Fahrenheit
-Average distance from the Sun is: 93.2 million miles
-Rotational period: 24 hours
-Orbital period: 365 days
I am home to millions of different forms of life including bacteria, animals, plants and you humans. At present I am the only place in the Universe where any kind of life, simple or complex, is known to exist. About 71% of my surface is covered with water, giving me my characteristic blue appearance from Space. This presence and abundance of liquid water makes me unique compared to my planetary neighbors. Liquid water is a fundamental element for lift to exist.