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Credit & Copyright: Apollo 17 Crew,
NASA
Explanation:
Welcome to Planet
Earth, the third planet from a
star named the
Sun. The
Earth is shaped like a
sphere and
composed mostly of rock.
Over 70 percent of the
Earth's surface is
water.
The planet has a relatively thin
atmosphere
composed mostly of
nitrogen and
oxygen.
Earth has a single large
Moon which is about 1/4 of its
diameter and, from the planet's surface,
is seen to have almost exactly the same angular size as the Sun.
With its abundance of liquid water, Earth
supports a large variety of
life
forms, including potentially intelligent species such as
dolphins and
humans.
Please enjoy your stay on Planet Earth.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
Based on Astronomy Picture
Of the Day
Publications with keywords: Earth - planet
Publications with words: Earth - planet
See also: