Credit & Copyright: NASA,
Apollo 17 Crew
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.
The featured picture of Earth, dubbed
The Blue Marble,
was
taken from
Apollo 17 in 1972 and features
Africa and
Antarctica.
It is thought to be one of the most
widely distributed photographs of any kind.
Earth has a single large
Moon
that 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.
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