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redshift |
Also found in: Wikipedia | 0.03 sec. |
redshiftDisplacement of the spectrum of an astronomical object toward longer wavelengths (visible light shifts toward the red end of the spectrum). In 1929 Edwin Hubble reported that distant galaxies had redshifts proportionate to their distances (see Hubble's constant). Since redshifts can be caused by motion of an object away from the observer (the Doppler effect), Hubble concluded that all galaxies are receding from each other. This became the cornerstone of theories of an expanding universe. redshift [′red‚shift] (astrophysics) A systematic displacement toward longer wavelengths of lines in the spectra of distant galaxies and also of the continuous portion of the spectrum; increases with distance from the observer. Also known as Hubble effect. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Hu's team relied on a filter through which only the redshifted Lyman-alpha wavelength passes (SN: 5/2/98, p. We know that quasar spectra are drastically redshifted during their multibillion-year journey to Earth. It turns out that when an observer peers at a distant, and thus highly redshifted, galaxy, the intensity of the light it emits appears drastically reduced. |
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