Imatge:M57RingNebula.jpg

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Imatge
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Description	Image of M57/NGC 6720 (The Ring Nebula) from NASA's Spitzer Space Telescope. "Spitzer's infrared array camera detected this material expelled from the withering star. Previous images of the Ring Nebula taken by visible-light telescopes usually showed just the inner glowing loop of gas around the star. The outer regions are especially prominent in this new image because Spitzer sees the infrared light from hydrogen molecules. The molecules emit the infrared light that they have absorbed ultraviolet radiation from the star or have been heated by the wind from the star."
Source	http://www.spitzer.caltech.edu/Media/releases/ssc2005-07/index.shtml
Date	20 April 2004
Author	NASA/JPL-Caltech/J. Hora (Harvard-Smithsonian CfA)
Permission (Reusing this image)	"NASA still images, audio files and video generally are not copyrighted. You may use NASA imagery, video and audio material for educational or informational purposes, including photo collections, textbooks, public exhibits and Internet Web pages. This general permission extends to personal Web pages."

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This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).

Warnings:

Use of NASA logos, insignia and emblems are restricted per US 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 from the Hubble Space Telescope may be copyrighted if they do not explicitly come from the STScI. [1]
All materials created by the SOHO 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]

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	Data/Hora	Dimensions	Usuari	Comentari
actual	08:46, 2 nov 2006	2.104??1.726 (569 KB)	Blankfaze

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Resoluci?? vertical	72 ppp
Programari usat	Adobe Photoshop CS2 Windows
Data i hora de modificaci?? de l'arxiu	09:50, 19 oct 2006
Espai de color	65535

Imatge:M57RingNebula.jpg

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