Stars

   Star is a huge, hot, shining ball of burning gases in space that produces a tremendous amount of light and other forms of energy. The Sun is a star, and it supplies Earth with light and heat energy. The stars look like twinkling points of light except for the sun. So are they really a point? No. The stars that we see in the night sky look like a point because they are very far away from us, millions of light years away. In fact the...

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Galaxies

    Galaxy is a system of stars, dust and gas held together by gravity. Galaxies are the building blocks of our solar system. Our solar system is in a galaxy called the Milky Way galaxy. Scientists estimate that there are more 100 billion galaxies scattered throughout the visible universe then just think how many more might be there. Astronomers have photographed millions of them through telescopes. The most distant galaxies...

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How do our speakers work?

Moving coil microphone or dynamic microphone:  The construction of a dynamic microphone resembles that of a loudspeaker, but in reverse. It is a moving coil type microphone which has a very small coil of thin wire suspended within the magnetic field of a permanent magnet. As the sound wave hits the flexible diaphragm, the diaphragm moves back and forth in response to the sound pressure acting upon it, and the attached coil of wire also...

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