Can somepne please explain Red-Shift for me? I need it to be broken-down. I wanna know what the red-shift does for us.
by 
Pohlizye
ANSWERS: 3
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Different colors of light are said to have certain wavelengths. Think of a drawing of a wave seen from the side. It looks sort of like a stretched-out spring, doesn't it? Now imagine that you are looking at a light source that appears to be green (for example). The light waves are traveling from the light to your eyes. As long as you and the light source stay still relative to each other, nothing changes. The light stays green. But if the light source starts moving away from you, it's like the spring is stretching out. That means more distance between the wave crests. In other words, when the light is moving away, the waves are stretched out. The wavelength gets longer. In visible light, the longest wavelength is red; the shortest is blue. So as the wavelength of a light gets longer, the color gets redder. The color APPEARS to shift toward red. But it doesn't really shift. It's just the effect of the motion. This is really hard to do without a drawing. If it didn't help, I apologize.
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Anguilla that was excellent......I really understood it. It's similar to the Doppler Effect but in this case they are talking about light. Right??? Douglas yours was good as well.
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Cf: http://en.wikipedia.org/wiki/Red_shift
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