File:CL0024+17opt.jpg

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Original file ‎(3,838 × 3,928 pixels, file size: 18.67 MB, MIME type: image/jpeg)

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This rich galaxy cluster, catalogued as CL0024+17, is allowing astronomers to probe the distribution of dark matter in space. The blue streaks near the center of the image are the smeared images of very distant galaxies that are not part of the cluster. The distant galaxies appear distorted because their light is being bent and magnified by the powerful gravity of CL0024+17, an effect called gravitational lensing.

Dark matter cannot be seen because it does not shine or reflect light. Astronomers can only detect its influence by how its gravity affects light. By mapping the distorted light created by gravitational lensing, astronomers can trace how dark matter is distributed in the cluster. While mapping the dark matter, astronomers found a dark-matter ring near the cluster's center. The ring's discovery is among the strongest evidence that dark matter exists.

The Hubble observations were taken in November 2004 by the Advanced Camera for Surveys.
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Author NASA, ESA, M.J. Jee and H. Ford (Johns Hopkins University)
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Public domain This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.
The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org. For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag.
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Composite image; reconstructed dark matter is made apparent
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current15:01, 19 July 2009Thumbnail for version as of 15:01, 19 July 20093,838 × 3,928 (18.67 MB)Tryphon (talk | contribs)Original size.
02:10, 17 May 2007Thumbnail for version as of 02:10, 17 May 20071,251 × 1,280 (1.97 MB)Clh288~commonswiki (talk | contribs){{Information |Description=This rich galaxy cluster, catalogued as Cl 0024+17, is allowing astronomers to probe the distribution of dark matter in space. The blue streaks near the center of the image are the smeared images of very distant galaxies that ar

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