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READSOLR.TXT
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1989-05-05
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103 lines
Our Sun is
a star and is
the center of
the Solar System.
The Solar System
consists of the Sun
and several planets.
Five planets were known
to ancient heaven-gazers;
now we know eight
in addition to Earth.
(This does not
include the "minor
planets," or asteroids.)
In order of
increasing distance
from the Sun,
the planets are
Mercury, Venus, Earth,
Mars, Jupiter, Saturn,
Uranus, Neptune and Pluto.
Pluto is 40 times
as far from the Sun
as Earth is.
Jupiter, the largest
of the planets,
is 40 times larger
than Earth in diameter.
Venus is almost
the same size as Earth.
When viewed through
good binoculars or
a small telescope,
Venus at her
brightest shows a
crescent shape, like
that of the crescent
phase of the moon.
The reddish color
of Mars is well known.
With a small telescope,
it is possible to see
details on the surface.
Some observers have
called these "canals,"
and some have guessed
that they were built
by intelligent beings.
Mars, like Earth and
some other planets,
has moons--two for
the planet Mars.
Jupiter has colored bands
that can be seen
with a small telescope,
and the famous Red Spot.
Jupiter has 11 moons,
of which four can be
observed with binoculars
or a small telescope.
The best-known feature
of Saturn is its
beautiful set of rings.
Both Jupiter and Saturn
rotate around their axes
in about 10 hours--
a short day!
Uranus, Neptune and Pluto,
the most distant planets,
were all discovered
after the invention
of the telescope.
In addition to its
great distance from us,
Pluto's small size--
about one-half the diameter
of the earth--
makes it beyond the range
of small telescopes.
The planets have been
of intense interest
to mankind since
earliest times, and now
the exploration of space
by rocket-launched vehicles
promises more answers
to more questions.
In May of 1989,
the month when this
was written, the Atlantis
spacecraft sent an
exploratory vehicle to
the farthest reaches
of the planetary system.
It will be fascinating
to see what new wonders
will be revealed in
the heavens to which
man has turned his eyes
since earliest times.