Thanks to the Doppler Effect, the wavelength of light observed from an object moving relative to us is shifted depending on its velocity. Using this technique, astronomers were recently able to measure the velocity of the innermost gas ejected in a very nearby supernova explosion SN1987a, probing exactly how this star exploded in the first place. Read more about it here and here. Very exciting stuff!
Thursday, October 21, 2010
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