custom essays on cosmic lens (1 essays)

With the discovery of double quasar Q0957 561 gravitational lensing became an observable science . So far 64 double , triple and multiple quasars have been found . The CLASS (Cosmic Lens All-Sky Survey ) project has mapped more than 10 ,000 radio sources and 17 multiply imaged systems . To identify whether it is real quasar or an illusion , observes have developed a checklist . They see whether the quasars lie at the same distance , whether their spectra is similar , whether there is any potential...