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ID:1213715
User:108.166.138.178
Article:Dark matter
Diff:
(Babcock's Andromeda rotation curve measurement in 1939)
(Galaxy clusters and gravitational lensing)
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[[File:Gravitationell-lins-4.jpg|thumb|Strong gravitational lensing as observed by the [[Hubble Space Telescope]] in Abell 1689 indicates the presence of dark matter—enlarge the image to see the lensing arcs.]]
 
[[File:Gravitationell-lins-4.jpg|thumb|Strong gravitational lensing as observed by the [[Hubble Space Telescope]] in Abell 1689 indicates the presence of dark matter—enlarge the image to see the lensing arcs.]]
   
A gravitational lens is formed when the light from a very distant, bright source (such as a [[quasar]]) is "bent" around a massive object (such as a [[galaxy cluster|cluster of galaxies]]) between the source object and the observer. The process is known as gravitational lensing.
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A gravitational lens is formed when the light from a very distant, bright source (such as a [[quasar]]) is "bent" around a GIANT FRUIT BOWL LIKE A SIR (such as a [[galaxy cluster|cluster of galaxies]]) between the source object and the observer. The process is known as gravitational lensing.
   
 
Dark matter affects galaxy clusters as well. [[X-ray]] measurements of hot [[intergalactic medium|intracluster gas]] correspond closely to Zwicky's observations of mass-to-light ratios for large clusters of nearly 10 to 1. Many of the experiments of the [[Chandra X-ray Observatory]] use this technique to independently determine the mass of clusters.<ref>
 
Dark matter affects galaxy clusters as well. [[X-ray]] measurements of hot [[intergalactic medium|intracluster gas]] correspond closely to Zwicky's observations of mass-to-light ratios for large clusters of nearly 10 to 1. Many of the experiments of the [[Chandra X-ray Observatory]] use this technique to independently determine the mass of clusters.<ref>
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