Earth, our home planet, is the only planet in our solar system known
to harbor life - life that is incredibly diverse. All of the things we need
to survive are provided under a thin layer of atmosphere that separates
us from the uninhabitable void of space. Earth is made up of complex,
interactive systems that are often unpredictable. Air, water, land, and
life - including humans - combine forces to create a constantly
changing world that we are striving to understand.
Viewing Earth from the unique perspective of space provides the
opportunity to see Earth as a whole. Scientists around the world have
discovered many things about our planet by working together and
sharing their findings.
Some facts are well known. For instance, Earth is the third planet from
the Sun and the fifth largest in the solar system. Earth's diameter is just
a few hundred kilometers larger than that of Venus
. The four seasons
are a result of Earth's axis of rotation being tilted more than 23 degrees.
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