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Light is a beautiful form of energy. It gives brightness and also warmth some time. Light is the fastest energy. Light has two sources. They are natural source and artificial source. Our own sun is a natural source of light. It produces light. That is, it emanates light. Stars also do emit light on their own. Sun is also a star. Sun is the source of light and energy in our solar system. All other heavenly bodies in our system simply reflect the light emitted by the sun. We calculate the space distance in terms of light year. Our nearest star other than sun is Alpha century, which is 3 light years away from us.