Saturday 18 July 2009

Astronomy For Children.

By Colin Jones

Astronomy is a very serious branch of science, although many people become interested in it when they are very young. Astronomy is a thought-provoking hobby that can teach children about the other sciences in general. Certain astronomical subjects interest kids and movies like Star Wars and they only increase this attraction.

Our only natural satellite is called the moon. Its orbit around the Earth takes just over twenty seven days to complete. Man's knowledge being what it is and because the moon is so near, it is the only space object that mankind has ever set foot on, except for the Earth of course. The effects of gravity between the moon and Earth causes the seas' tides. The moon is one of the first objects that sparks a child's interest in astronomy because it can be clearly seen with the human eye.

Consider Sol, our own star, the sun. The distance between our home and the sun is huge, although it varies from 91 to 94 million miles. The reason for the variance is the Earth's elliptical orbit. If there were no sun, we wouldn't be alive. The sun delivers both light and heat to the planets. A little known fact is that the sun contains about 98% of the mass in the solar system. That is massive!

Our planet is in the galaxy called the Milky Way. Like all other galaxies it's a very large collection of gas, dust, stars and planets. Most of the area in a galaxy is filled with nothing, only empty space. That means that most of its volume, 3,000 light years high by 100,000 light years diameter, the size of our galaxy, is empty.

The Earth is situated somewhere in the neighbourhood of 30,000 light years from the very centre of our galaxy. The emptiness 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 just like a pool of liquid, which is why it was given the name Milky Way. There are four kinds of galaxies: elliptical, lenticular, irregular and, like the Milky Way, spiral.

There is a lot of information about astronomy on the Internet that is fit for children: it ranges from dictionaries and encyclopaedic references to programs that show the paths of the different planets, solar systems and objects right on the computer's monitor! In deed, there's more information out there than a child could ever get through.

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