File:Einstein cross.jpg

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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.

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

13 September 1990

Source

http://hubblesite.org/newscenter/archive/releases/1990/20/image/a/

Author

NASA, ESA, and STScI

Permission
(Reusing this file)

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


	This is a featured picture on the Persian language Wikipedia (نگاره‌های برگزیده) and is considered one of the finest images. See its nomination here. If you think this file should be featured on Wikimedia Commons as well, feel free to nominate it. If you have an image of similar quality that can be published under a suitable copyright license, be sure to upload it, tag it, and nominate it.

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.

This file has an extracted image: Einstein cross (cropped).jpg.

File history

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	Date/Time	Dimensions	User	Comment
current	07:39, 15 December 2010	1,915 × 1,849 (707 KB)	Tryphon	Reverted to version as of 17:16, 26 January 2010: no need to compress it too much.
	07:10, 15 December 2010	1,914 × 1,848 (205 KB)	Materialscientist	JPG compression
	17:16, 26 January 2010	1,915 × 1,849 (707 KB)	Tryphon	Cropped from http://imgsrc.hubblesite.org/hu/db/images/hs-1990-20-a-full_tif.tif.
	17:11, 26 January 2010	2,457 × 2,277 (353 KB)	Tryphon	Higher resolution, from http://imgsrc.hubblesite.org/hu/db/images/hs-1990-20-a-full_jpg.jpg.
	08:40, 13 June 2007	300 × 278 (12 KB)	Markus Pössel	Image taken by Hubble Space Telescope; description at http://hubblesite.org/newscenter/archive/releases/1990/20/image/a/ Credit: NASA and ESA {{PD-Hubble}}