File:Einstein cross.jpg

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Original file (1,915 × 1,849 pixels, file size: 707 KB, MIME type: image/jpeg)

Captions

Captions

This picture shows gravitational lens G2237 + 0305 — sometimes referred to as the Einstein Cross. It shows four images of a very distant quasar which has been multiple-imaged by a relatively nearby galaxy acting as a gravitational lens.

Summary

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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.

العربية: تقاطع أينشتاين: أربع صور لنفس النجم الزائف البعيد (وذلك بفعل عدسة الجاذبية الناتجة عن المجرة الأقرب لنا، والظاهرة في المقدمة، وهي مجرة عدسة هاكرا).
Date
Source http://hubblesite.org/newscenter/archive/releases/1990/20/image/a/
Author NASA, ESA, and STScI
Permission
(Reusing this file)
Public domain
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 only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.

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. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org.

For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag.

Assessment

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Wikipedia

 This is a featured picture on the Persian language Wikipedia (نگاره‌های برگزیده) and is considered one of the finest images. See its nomination here.

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Description from other version: An Einstein Cross reveals the presence of a huge gravitational lens in the distant reaches of the universe. Astronomers discovered this gravitational lens in 1985 using survey maps of the sky obtained with the Hubble Space Telescope (HST). The bright object at the center of the image is a distant galaxy. The four bright objects surrounding it are actually multiple images of a single quasar that lies far beyond the galaxy. The lens was named the Einstein Cross in honor of Albert Einstein, whose relativity theory predicted the phenomena decades before the first gravitational lens was observed in 1979.

Image extraction processThis file has an extracted image: Einstein cross (cropped).jpg.
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File history

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Date/TimeThumbnailDimensionsUserComment
current07:39, 15 December 2010Thumbnail for version as of 07:39, 15 December 20101,915 × 1,849 (707 KB)Tryphon (talk | contribs)Reverted to version as of 17:16, 26 January 2010: no need to compress it too much.
07:10, 15 December 2010Thumbnail for version as of 07:10, 15 December 20101,914 × 1,848 (205 KB)Materialscientist (talk | contribs)JPG compression
17:16, 26 January 2010Thumbnail for version as of 17:16, 26 January 20101,915 × 1,849 (707 KB)Tryphon (talk | contribs)Cropped from http://imgsrc.hubblesite.org/hu/db/images/hs-1990-20-a-full_tif.tif.
17:11, 26 January 2010Thumbnail for version as of 17:11, 26 January 20102,457 × 2,277 (353 KB)Tryphon (talk | contribs)Higher resolution, from http://imgsrc.hubblesite.org/hu/db/images/hs-1990-20-a-full_jpg.jpg.
08:40, 13 June 2007Thumbnail for version as of 08:40, 13 June 2007300 × 278 (12 KB)Markus Pössel (talk | contribs)Image taken by Hubble Space Telescope; description at http://hubblesite.org/newscenter/archive/releases/1990/20/image/a/ Credit: NASA and ESA {{PD-Hubble}}

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