Marine Electronics

Astronomy is a very serious branch of science, although a lot of people get involved with it when they are quite young. Astronomy is a thought-provoking hobby that can show children about the other sciences in general. Certain astronomical subjects inspire kids and movies like Star Wars and they only increase this interest.

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.

Let's consider the sun. Earth is quite far from the sun, although the distance actually 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 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 diameter, the volume of our galaxy, is empty.

Our Earth is situated somewhere in the vicinity of 30,000 light years from the central core of our galaxy. The emptiness is broken up by over 100 billion stars. In fact, the galaxy was named after 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 sorts of galaxies: elliptical, lenticular, irregular and, like the Milky Way, spiral.

There is a great deal of information about astronomy that is fit for children on the Internet: from dictionaries and encyclopaedic references to programs that show different planets, solar systems and objects right on the computer's monitor! In fact, there's more information than a child could ever read.