File:X-ray image of the NGC 2300 group of galaxies (opo9305a).jpg

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X-ray_image_of_the_NGC_2300_group_of_galaxies_(opo9305a).jpg ‎(285 × 340 pixels, file size: 41 KB, MIME type: image/jpeg)

Captions

Captions

ROSAT's X-ray picture of a small cluster of galaxies known as the NGC 2300 group. The cluster lies 150 million light years from Earth in the direction of the northern constellation Cepheus.

Summary

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Description
English: ROSAT's X-ray picture of a small cluster of galaxies known as the NGC 2300 group. The cluster lies 150 million light years from Earth in the direction of the northern constellation Cepheus.Taken with the Position Sensitive Proportional Counter instrument during in April 1992, the image shows that the small group of galaxies is immersed in a huge cloud of hot gas (in purple) about 1.3 million light-years in diameter.The ROSAT observation implies that most of the mysterious "dark matter" is concentrated in and around small groups of galaxies. The clue to the presence of dark matter is the fact that the hot cloud should have dissipated into space long ago unless it was held together by the gravity of an immense mass.
Date 4 January 1993 (upload date)
Source X-ray image of the NGC 2300 group of galaxies
Author NASA
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Licensing

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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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current22:27, 17 June 2024Thumbnail for version as of 22:27, 17 June 2024285 × 340 (41 KB)OptimusPrimeBot (talk | contribs)#Spacemedia - Upload of https://cdn.esahubble.org/archives/images/large/opo9305a.jpg via Commons:Spacemedia

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