It is most prominent when the distorting object lies halfway between the Earth and the more distant object, usually a quasar.
It is possible to measure the exact value of the Hubble Constant by observing these phenomenon, and in the Large Magellanic Cloud the largest known mass of the dark matter particles known as MACHOs were detected because of them. When the alignment is not perfectly symmetric, a group of images known as an Einstein Cross will appear, and in the event of perfect symmetry, an Einstein Ring will be seen. It is most prominent when the distorting object lies halfway between the Earth and the more distant object, usually a quasar. FTP, identify this phenomenon where a large mass such as galaxy bends light to the point where the illusion of a double image can be observed on Earth.
It is possible to measure the exact value of the Hubble Constant by observing these phenomenon, and in the Large Magellanic Cloud the largest known mass of the dark matter particles known as MACHOs were detected because of them.
gravitational lensing or gravitational lens