According to Einstein's theory of General Relativity, mass bends space, causing light not to travel in a straight line by curve. Therefore, massive objects can act like lenses, amplifying the line observed from objects behind them. Lots of these have been seen, most commonly a galaxy lensing a quasar behind it. Well, recently, a quasar was discovered lensing a background galaxy. Neat. Read more about it here.
Saturday, September 11, 2010
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