Image:Einsteincross.jpg

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J.Rhoads, S.Malhotra, I.Dell'Antonio (NOAO)/WIYN/NOAO/NSF

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[edit] Summary

This picture of the gravitationally lensed quasar Q2237+0305 and the associated lensing spiral galaxy was taken by the 3.5-meter WIYN telescope, on the night of October 4, 1999.

This system is also known as Huchra's Lens, after its discoverer, and the Einstein Cross, because it is such an excellent example of the phenomenon of gravitational lensing, postulated by Einstein as soon as he realised that gravity would be able to bend light and thus could have lens-like effects.

- from NOAO Image Gallery: Q2237+0305 (Einstein Cross):

[edit] Licensing

Educational/Research Use: NOAO allows reproduction, authorship of derivative works, and other transformations of the original work strictly for educational and research purposes without further permission, subject to the General Conditions section stated above. Some examples of non-commercial uses for educational and research purposes are: academic curricula developed by teachers, research papers written by students or scholars, non-profit educational or non-profit research publications produced by authors or publishers, educational outreach activities composed by amateur astronomers, and news media stories. For other non-commercial uses, permission should be obtained from NOAO/AURA.

- from NOAO/AURA Image Library Conditions of Use

This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of 17 U.S.C. § 105. See Copyright.

Note: This only applies to works of the Federal Government and not to the work of any individual US state, territory, commonwealth, county, subdivision, or municipality.

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(del) (cur) 21:40, 11 March 2007 . . Atropos235 (Talk | contribs) . . 1024×680 (41,264 bytes) (National Optical Astronomy Observatory/Association of Universities for Research in Astronomy/National Science Foundation Educational/Research Use: NOAO allows reproduction, authorship of derivative works, and other transformations of the original work s)