File:Einstein gyro gravity probe b.jpg

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This picture was nominated as a featured picture candidate in April 2006 and July 2007.

Summary

One of the most perfect spheres ever created by humans. A fused quartz gyroscope for the Gravity Probe B experiment which differs from a perfect sphere by no more than a mere 40 atoms of thickness as it refracts the image of Albert Einstein in the background.

Licensing

	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

Imagen tomada de en.wikipedia.org/wiki/Image:Einstein_gyro_gravity_probe_b.jpg

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Dimensions	User	Comment
current	18:25, 9 August 2012	3,552 × 2,384 (4.45 MB)	Bolkovia	Reverted to version as of 02:36, 20 January 2006. It's the original one and the previous user gave no reason
	08:31, 11 December 2010	3,552 × 2,384 (4.75 MB)	Phelipemancheno	Reverted to version as of 07:45, 5 June 2010
	15:24, 9 June 2010	3,552 × 2,384 (4.45 MB)	Amandajm	Reverted to version as of 02:36, 20 January 2006 Aavindraa, unless YOU were the original photographer, do not overlay the original with you automatic digital adjustments. Save elsewhere
	06:44, 9 June 2010	3,552 × 2,384 (4.75 MB)	Aavindraa	image was badly photographed and tones were automatically corrected using software. no "definition" whatsoever was lost.
	13:23, 8 June 2010	3,552 × 2,384 (4.45 MB)	Amandajm	Reverted to version as of 02:36, 20 January 2006 The change resulted in loss of definition, and was unnecessary
	07:45, 5 June 2010	3,552 × 2,384 (4.75 MB)	Aavindraa	fix contrast - looks like an 80's pic as is
	02:36, 20 January 2006	3,552 × 2,384 (4.45 MB)	Tano4595	One of the most perfect spheres ever created by humans. A fused quartz gyroscope for the Gravity Probe B experiment which differs from a perfect sphere by no more than a mere 40 atoms of thickness as it refracts the image of Einstein in the background.