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Light is a form of energy that enables us to see things around us. Without light, the world would be completely dark and we wouldn’t be able to see. A luminous source is an object that emits light, such as the sun or a human made incandescent lamp. There are three types of media. Transparent media allows all light to pass through it, like glass for example. Translucent media allows some light to pass through it, like tinted glass. Opaque media allows absolutely no light to pass through it, such as a brick wall.
Light moves at the fastest known speed in the universe. It takes about eight minutes for light to get from the sun to earth and about 1.3 seconds to ret from the moon to earth. Light travels in a straight path.
Scientists have been trying to determine the speed of light for a long period of time. Galileo was the first scientist to attempt an experiment to determine the speed of light.

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