Welcome to Planet Earth
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.
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.
