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The Blue Marble
Earth At Night
This composite view of earth shows the global city lights
as seen by the Defense Meteorological Satellite.
Mosaic of the United States
A mosaic of the United
States prepared by
using 16 images from
the Advanced Very
High Resolution
Radiometer (AVHRR)
sensors on the
satellites NOAA-8 and
NOAA-9. The images
were acquired
between May 24, 1984
and May 14, 1986.
Earth Facts
Third Planet from the Sun
Diameter at the Equator
7,926 miles
Equatorial circumference
24, 902.4 miles
Distance from Sun
93 Million Miles
Length of Day
24 Hours
Revolution Period about the Sun
365 days 5 hrs
Surface Temperature
-128° F to 136° F
1 (the Moon)
Earth’s orbit
The earth goes
around the sun
once each year
while meanwhile
rotating about its
axis once each day.
Earth Mythology
Planetary Symbol
Gaea, or Mother Earth, was the great
goddess of the early Greeks. She
represented the Earth and was worshipped
as the universal mother. In Greek
mythology, she created the Universe and
gave birth to both the first race of gods (the
Titans) and the first humans.
Note: Earth is the only planet whose English name does not derive from
Greek/Roman mythology. The name derives from Old English and Germanic.
Journey to the Center of the Earth
Earth's Layers
(depths in km)
The earth is
divided into four
main layers: the
inner core, outer
core, mantle,
and crust.
The Moon
This full disc of the Moon
was photographed by the
Apollo 17 crew. The
Moon is on average
238,857 miles from the
Earth. Its diameter is
2,160 miles. Both the
rotation of the Moon and
its revolution around
Earth takes 27 days, 7
hours, and 43 minutes.
Earth as seen from the Moon
This view of the
Earth rising over
the Moon's
horizon was
taken from the
Apollo 11
spacecraft. The
lunar terrain
pictured is in the
area of Smyth's
Sea on the