File:Lymanalpha.gif

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

Lymanalpha.gif(512 × 384 pixels, file size: 66 KB, MIME type: image/gif)

Summary

Description
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
Source https://apod.nasa.gov/apod/ap001112.html
Author J. Shalf, Y. Zhang (UIUC) et al., GCCC
Other versions
PNG

Licensing

Public domain 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:

Original upload log

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

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

12 November 2000

image/gif

File history

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

Date/TimeThumbnailDimensionsUserComment
current19:18, 20 February 2019Thumbnail for version as of 19:18, 20 February 2019512 × 384 (66 KB)Betelgeuse1960Transferred from en.wikipedia via #commonshelper
The following pages on the English Wikipedia use this file (pages on other projects are not listed):

Global file usage

The following other wikis use this file: