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In this article, the author explains what astronomers have learned about the universe by examining the light from other galaxies. Two Shockwave features and a labeled illustration supplement discussions of Doppler shift (or the Doppler effect), the phenomena of redshifts and blueshifts, and the false notion that Earth is the center of the expanding universe. The author points out the similarities between what an observer detects when sound or light waves move towards or away from the person. Astronomers have found that most of the light from other galaxies is redshifted--evidence that the universe is expanding. They also think that the expansion rate is accelerating and are investigating if this expansion is likely to continue. Copyright 2005 Eisenhower National Clearinghouse
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