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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a fool or simpleton; ninny. |
| Main Entry: | red shift |
| Part of Speech: | n |
| Definition: | in astronomy, an increase in the wavelength of radiation emitted by astronomical objects, causing a shift of features in their spectra towards longer wavelengths due to their recession from the observer |
| Usage: | science |
| red shift
See under Doppler effect. |
In physics, the reddening of light sent out by an object that is moving away from an observer. (See Doppler effect.)
Note: The red shift that can be observed in light from distant galaxies suggests that the universe is expanding, and thus supports the Big Bang theory.