集信:Artist's concept of collision at HD 172555.jpg

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Summary

Description	English: This artist's concept shows a celestial body about the size of our moon slamming at great speed into a body the size of Mercury. NASA's Spitzer Space Telescope found evidence that a high-speed collision of this sort occurred a few thousand years ago around a young star, called HD 172555, still in the early stages of planet formation. The star is about 100 light-years from Earth. العربية: تصور لفرضية الاصطدام العملاق التي يعتقد أنه شكّل القمر. Français : 70 à 95 % de l'eau de la Terre daterait d'avant la formation de la Lune issue de l'impact de Théia sur la Terre. Cet impact aurait entraîné la volatilisation d'une partie de l'eau déjà formée mais la majorité serait restée condensée, ce qui impliquerait que seulement de 5 à 30 % de l'eau de la Terre provienne d'un apport extra-terrestre (comètes et météorites) ultérieur (source
Date	26 August 2009
Source	http://www.nasa.gov/multimedia/imagegallery/image_feature_1454.html
Author	NASA/JPL-Caltech

	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."

The original description page was here. All following user names refer to en.wikipedia.

Upload date	User	Bytes	Dimensions	Comment
2009-08-26 15:17:12	Originalwana	365408	3000×2400	Higher res
2009-08-20 10:20:04	Cmlisse	28820	600×480	{{Information \|Description = \|Source = \|Date = \|Author = \|Permission = \|other_versions = }}

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	𣈜／𣇞	形䀡𠓀	戟櫸	成員	描寫
現在	04:30、𣈜29𣎃11𢆥2009		3.000×2.400 (357kB)	wikimediacommons>CommonsHelper2 Bot	{{BotMoveToCommons\|en.wikipedia\|year={{subst:CURRENTYEAR}}\|month={{subst:CURRENTMONTHNAME}}\|day={{subst:CURRENTDAY}}}} {{Move to Commons}} {{Information \|Description = {{en \|This artist's concept shows a celestial body about the size of our moon slammi

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