Portal:Cosmology
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The Cosmology Portal
Lua error in package.lua at line 80: module 'Module:Box-header/colours' not found. In physics, redshift happens when light or other electromagnetic radiation from an object is increased in wavelength, or shifted to the red end of the spectrum. In general, whether or not the radiation is within the visible spectrum, "redder" means an increase in wavelength – equivalent to a lower frequency and a lower photon energy, in accordance with, respectively, the wave and quantum theories of light. Some redshifts are an example of the Doppler effect, familiar in the change in the apparent pitches of sirens and frequency of the sound waves emitted by speeding vehicles. A redshift occurs whenever a light source moves away from an observer. Another kind of redshift is cosmological redshift, which is due to the expansion of the universe Lua error in package.lua at line 80: module 'Module:Box-header/colours' not found. Did you know...
Lua error in package.lua at line 80: module 'Module:Box-header/colours' not found. Edwin Powell Hubble was an American astronomer who played a crucial role in establishing the field of extragalactic astronomy and is generally regarded as one of the most important observational cosmologists of the 20th century. Hubble is known for showing that the recessional velocity of a galaxy increases with its distance from the earth, implying the universe is expanding. Known as "Hubble's law", this relation had been discovered previously by Georges Lemaître, a Belgian priest/astronomer who published his work in a less visible journal. There is still much controversy surrounding the issue, and some argue that it should be referred to as "Lemaître's law", although this change has not taken hold in the astronomy community. Lua error in package.lua at line 80: module 'Module:Box-header/colours' not found.
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