Ficheiro:Einstein cross.jpg

Summary

Description The European Space Agency's Faint Object Camera on board NASA's Hubble Space Telescope has provided astronomers with the most detailed image ever taken of the gravitational lens G2237 + 0305 — sometimes referred to as the Einstein Cross. The photograph shows four images of a very distant quasar which has been multiple-imaged by a relatively nearby galaxy acting as a gravitational lens. The angular separation between the upper and lower images is 1.6 arcseconds. Date 13 September 1990 Source http://hubblesite.org/newscenter/archive/releases/1990/20/image/a/ Author NASA, ESA, and STScI

Copyright status:

This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that NASA, STScI, and/or ESA is credited as the source of the material. The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre.

Source:

http://commons.wikimedia.org/wiki/File:Einstein_cross.jpg