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February 28, 2015

February 28, 2015

Posted by **pradee** on Saturday, November 27, 2010 at 3:42am.

- physics -
**drwls**, Saturday, November 27, 2010 at 6:00amI do not know what you mean by a "pl" spectrum

A red shift occurs when the observer and the object are moving apart. Wavelengths of spectroscopic features, such as atomic lines, are shifted to longer values when this happens.

A blue shift occurs if an observed object and the observer are moving towards each other.

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