Introduction to Earth
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.
Oceans at least 4 km deep cover nearly 70 percent of Earth's surface.
Fresh water exists in the liquid phase only within a narrow temperature
span (0 degrees to 100 degrees Celsius). This temperature span is
especially narrow when contrasted with the full range of temperatures
found within the solar system. The presence and distribution of water
vapor in the atmosphere is responsible for much of Earth's weather
Near the surface, an ocean of air that consists of 78 percent nitrogen, 21
percent oxygen, and 1 percent other ingredients envelops us. This atmosphere
affects Earth's long-term climate and short-term local weather;
shields us from nearly all harmful radiation coming from the Sun; and
protects us from meteors as well - most of which burn up before they
can strike the surface. Satellites have revealed that the upper atmosphere
actually swells by day and contracts by night due to solar activity.
Our planet's rapid spin and molten nickel-iron core give rise to a magnetic
field, which the solar wind distorts into a teardrop shape. The
solar wind is a stream of charged particles continuously ejected from
the Sun. The magnetic field does not fade off into space, but has defi-
nite boundaries. When charged particles from the solar wind become
trapped in Earth's magnetic field, they collide with air molecules above
our planet's magnetic poles. These air molecules then begin to glow
and are known as the aurorae, or the Northern and Southern Lights.
Earth's land surfaces are also in motion. For example, the North
American continent continues to move west over the Pacific Ocean
basin, roughly at a rate equal to the growth of our fingernails.
Earthquakes result when plates grind past one another, ride up over
one another, collide to make mountains, or split and separate. These
movements are known as plate tectonics. Developed within the last
30 years, this explanation has unified the results of centuries of study
of our planet, long believed to be unmoving.
From the vantage point of space we are able to observe our planet
globally, as we do other planets, using similar sensitive instruments to
understand the delicate balance among its oceans, air, land, and life.
Source: NASA
Read a Newsletter Sample