FIGURE 1. Gravitational lensing.

From the following article:

Astronomy: Through a lens brightly

Edwin L. Turner

Nature 417, 905-906(27 June 2002)

doi:10.1038/417905a

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Light from a distant quasar is deflected by the gravitational field of a galaxy lying close to the line of sight from Earth to the quasar. As a result, the quasar appears brighter, and multiple images of the quasar may be seen. The inset image, taken by the Japanese Subaru telescope in Hawaii, shows four images of a single distant quasar (blue) formed around the central image of an elliptical galaxy (red) that is acting as a gravitational lens. Wyithe and Loeb5 propose that the exceptional brightness of a population of early-Universe quasars could be due to gravitational-lensing effects that are more common than had been thought.

NAOJ

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