You know how a police siren changes sound when it passes by you? That's the doppler effect. It works for sound waves and it works for light waves. Astronomers use the doppler effect to study the motion of objects across the Universe, from nearby extrasolar planets to the expansion of distant galaxies.
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Doppler Effect show notes and transcript.
© nancy for Universe Today, 2009. |
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Full story at http://www.universetoday.com/2009/12/26/podcast-dopler-effec/
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