Red shift, Light from a galaxy is stretched because it is moving away, Blue shift, Light from an object is compressed because it is moving closer, Expanding universe, Galaxies are moving away from each other, Evidence of expansion, Red shift observed in distant galaxies, Light spectrum, The range of colors produced by light, Galaxy motion, The movement of galaxies through space, Edwin Hubble, Scientist who discovered that the universe is expanding.

Red Shift

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