Astronomy is a very exact branch of science, although many people get involved with it when they are quite young. Astronomy is inspiring 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 path around the Earth takes just over twenty seven days to complete. Man’s knowledge being what it is and because the moon is so close, 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 naked eye.
Let’s move on to 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.
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 central core 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 types of galaxies: elliptical, lenticular, irregular and, like the Milky Way, spiral.
There is a great deal of information on astronomy on the Internet that is suitable 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 fact, there’s more information out there than a child could ever get through.
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