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File:Cumulative-absorption-spectrum-hubble-telescope.jpg

Description
English: Illustrates cumulative absorption spectra observed by Hubble.
A beam of light coming to Earth from a distant quasar passes through numerous intervening gas clouds in galaxies and in intergalactic space. These clouds of primeval hydrogen subtract specific colors from the beam. The resulting "absorption spectrum," recorded by Hubbles Space Telescope Imaging Spectrograph (STIS) is used to determine the distances and chemical composition of the invisible clouds.
Date 23 November 1998
Source http://hubblesite.org/newscenter/newsdesk/archive/releases/1998/41/image/r
Author NASA/STScI
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Public domain This file is in the public domain 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.)
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