Astronomy For Teens.
By Colin Jones

Astronomy is a very serious science, although many people
get involved with it when they are very young. for
kids is a thought provoking pursuit that can teach them
about the sciences in general. A number of astronomy
subjects interest kids and movies like Star Wars only serve
to increase this attraction.

The Earth's closest neighbour is the moon. Its path around
the Earth takes just over twenty seven days to complete.
Mankind has only ever walked on the Earth and the moon.
Gravity between the moon and Earth causes the tides. It's
brightness in the night sky attracts many children to learn
more about it and the overall subject of astronomy.

Let's move on to the sun. Earth is quite far from the sun,
although the distance fluctuates between about 91 million
miles and about 94 million miles. The reason for this
variance is because of Earth's elliptical orbit. Life on
Earth is only possible because of the sun, which is our
source of important elements such as light and heat. A
little-known fact is that the sun contains about 98% of the
mass

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of the whole solar system! Just think about how small a
person is compared to that.

We live in the galaxy called the Milky Way. Like all other
galaxies it's a collection of gas, dust, stars and planets.
Most of the area in a galaxy is filled with nothing, just
empty space. That means that most of its volume, 3,000 light
years high by 100,000 light years wide, the size of our
galaxy, is empty. We're somewhere in the neighborhood of
30,000 light years from the central core of our galaxy. The
nothingness is broken up by over 100 billion stars. In fact
the galaxy was named for the thick group of stars in the
main portion of it. It looks like a pool of liquid, thus the
name Milky Way. There are four types of galaxies:
elliptical, lenticular, irregular and, like the Milky Way,
spiral.

There is a lot of information about fit for
children on the Internet. From dictionaries and encyclopedic
references to programs that show different planets, solar
systems and objects right on the computer! There's more
information than a child could ever read.