Redshift: Difference between revisions
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'''Redshift''' is a natural phenomenon observed by astronomers observing distant galaxies. |
'''Redshift''' is a natural phenomenon observed by astronomers observing distant [[galaxy|galaxies]]. |
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The light from sources moving at significant speed away from the observer appear to be lower in frequency. |
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The [[light]] from sources moving at significant speed away from the observer appear to be lower in [[frequency]]. The light from sources moving at a significant speed towards the observer appear to be higher in frequency, which would be called ''blueshift'' if it was commonly observed. Red and blue shifts are a consequence of the [[Doppler effect]] on light waves. |
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This is easily measured because the emmision and absorbtion patterns for molecules are distinctive. |
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This can provide a means of measuring the speed between the source and the observer. |
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These shifts in frequency are easily measured because the [[emmision]] and [[absorbtion]] patterns for [[molecule|molecules]] are distinctive. The amount of frequency shift can provide a means of measuring the relative speed between the source and the observer. |
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[[Edwin Hubble]] was one of the primary researchers in this area of [[cosmology]]. It has been observed that the further away a galaxy is from us, the higher the relative speed away from us (greater redshift). Looking back in time, this suggests that all the [[matter]] in the [[universe]] originated from the same point. This has lead to the [[Big Bang]] theory. |
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[[Edwin Hubble]] was one of the primary researchers in this area. If the light source is moving towards the observer, a '''blueshift''' is seen. |
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Red and blue shifts are a consequence of the [[Doppler effect]] on light waves. |
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One of the most significant consequences of distant galaxies' redshift is that if all of them are increasing their distance from one another, going backwards this leads us to the [[Big Bang]] theory. |
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For an article about the novel, see ''[[Red Shift]].'' |
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'''[[Red Shift]].''' is also a novel by [[Alan Garner]]. |
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Revision as of 23:22, 16 December 2001
Redshift is a natural phenomenon observed by astronomers observing distant galaxies.
The light from sources moving at significant speed away from the observer appear to be lower in frequency. The light from sources moving at a significant speed towards the observer appear to be higher in frequency, which would be called blueshift if it was commonly observed. Red and blue shifts are a consequence of the Doppler effect on light waves.
These shifts in frequency are easily measured because the emmision and absorbtion patterns for molecules are distinctive. The amount of frequency shift can provide a means of measuring the relative speed between the source and the observer.
Edwin Hubble was one of the primary researchers in this area of cosmology. It has been observed that the further away a galaxy is from us, the higher the relative speed away from us (greater redshift). Looking back in time, this suggests that all the matter in the universe originated from the same point. This has lead to the Big Bang theory.
Red Shift. is also a novel by Alan Garner.
/Talk