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DescriptionLymanalpha.PNG	English: NASA Image of the day. Lyman Alpha absorption comes from ambient gas in the universe between us and distant quasars. This is a simulation of what clouds could've looked like at z=3 We live in a forest. Strewn throughout the universe are "trees" of hydrogen gas that absorb light from distant objects. These gas clouds leave numerous absorption lines in a distant quasar's spectra, together called the Lyman-alpha forest. Distant quasars appear to be absorbed by many more Lyman-alpha clouds than nearby quasars, indicating a Lyman-alpha thicket early in our universe. The above image depicts one possible computer realization of how Lyman-alpha clouds were distributed at a redshift of 3. Each side of the box measures 30 million light-years across. Much remains unknown about the Lyman-alpha forest, including the real geometry and extent of the clouds, and why there are so many fewer clouds today.
Date	12 November 2000
Source	https://apod.nasa.gov/apod/ap001112.html
Author	J. Shalf, Y. Zhang (UIUC) et al., GCCC
Other versions	gif

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	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."

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Date/Time	Dimensions	User	Comment
2019-02-02 23:30	512×384× (67458 bytes)	Sam-2727	NASA Image of the day. Can be found at https://apod.nasa.gov/apod/ap001112.html Lyman Alpha absorption comes from ambient gas in the universe between us and distant quasars. This is a simulation of what clouds could've looked like at z=3

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	10:02, 9 September 2019		502 × 373 (95 KB)	ديفيد عادل وهبة خليل 2 (talk \| contribs)	== {{int:filedesc}} == {{Information \|Description={{en\|1=NASA Image of the day. Lyman Alpha absorption comes from ambient gas in the universe between us and distant quasars. This is a simulation of what clouds could've looked like at z=3 * We live in a forest. Strewn throughout the universe are "trees" of hydrogen gas that absorb light from distant objects. These gas clouds leave numerous absorption lines in a distant quasar's spectra, together called the Lyman-alpha forest. Distant quasars a...

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File:Lymanalpha.PNG

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