The Outer Solar System
The Planets of the Outer Solar System
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National Schools'
Observatory
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of different gases that
surrounds a planet and
is held down by gravity.
Factfile: Atmosphere
An atmosphere is a layerof different gases that
surrounds a planet and
is held down by gravity.
The Earth's atmosphere
is mainly composed of
Nitrogen and Oxygen, and
provides the air that we
breathe and the wind that
blows in our face.
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An Atmosphere
An Atmosphere
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National
Schools'
Observatory
National
Schools'
Observatory