пятница, 13 августа 2010 г.

Why is Space black?

Where there is no light there is darkness. This means that a surrounding without light would be black in color. Our experience here on Earth (one common example, night and day) tells us that the color black (or darkness) indicates the absence of light. The light from the sun hitting these "obstacles" in the atmosphere (air) causes light to reflect and refract. The reflected (bouncing off) and the refracted (deflected when the light go through a substance) rays illuminates our surroundings allowing one the power to perceive by sight (see) the world in its splendid colors. This means that all the light in space will travel in a straight line without any dispersion (refraction and reflection). Therefore, you can only see spots of lights in space from its source but not the illumination of its surroundings. Light makes its way to our eyes because you are looking at something bright but the light itself is not scattered. Space has no atmosphere (almost a perfect vacuum) which means there is nothing for the light to become "scattered" on.

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