File:Hiding in the night sky.jpg
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Summary
[edit]DescriptionHiding in the night sky.jpg |
English: This striking NASA/ESA Hubble Space Telescope image captures the galaxy UGC 477, located just over 110 million light-years away in the constellation of Pisces (The Fish).
UGC 477 is a low surface brightness (LSB) galaxy. First proposed in 1976 by Mike Disney, the existence of LSB galaxies was confirmed only in 1986 with the discovery of Malin 1. LSB galaxies like UGC 477 are more diffusely distributed than galaxies such as Andromeda and the Milky Way. With surface brightnesses up to 250 times fainter than the night sky, these galaxies can be incredibly difficult to detect. Most of the matter present in LSB galaxies is in the form of hydrogen gas, rather than stars. Unlike the bulges of normal spiral galaxies, the centres of LSB galaxies do not contain large numbers of stars. Astronomers suspect that this is because LSB galaxies are mainly found in regions devoid of other galaxies, and have therefore experienced fewer galactic interactions and mergers capable of triggering high rates of star formation. LSB galaxies such as UGC 477 instead appear to be dominated by dark matter, making them excellent objects to study to further our understanding of this elusive substance. However, due to an underrepresentation in galactic surveys — caused by their characteristic low brightness — their importance has only been realised relatively recently. |
Date | |
Source | http://www.spacetelescope.org/images/potw1614a/ |
Author |
ESA/Hubble & NASA Acknowledgement: Judy Schmidt (Geckzilla) |
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[edit]ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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current | 09:19, 4 April 2016 | 1,280 × 1,019 (159 KB) | Jmencisom (talk | contribs) | User created page with UploadWizard |
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Credit/Provider | ESA/Hubble & NASA Acknowledgement: Judy Schmidt (Geckzilla) |
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Source | ESA/Hubble |
Usage terms |
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Short title |
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Image title |
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Date and time of data generation | 06:00, 4 April 2016 |
Software used | Adobe Photoshop CC 2014 (Windows) |
Copyright status | Copyright status not set |
Unique ID of original document | xmp.did:8ca71a81-4a2a-7343-a11c-687aa63c3453 |
Contact information |
Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
Keywords | UGC 477 |
IIM version | 4 |