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US-SPACE-ASTRONOMY
This August 27, 2008 image taken by the Hubble Space Telescope and Chandra X-ray Observatory show a clear separation between dark and ordinary matter during the clash 5.7 billion light years from Earth, the US space agency said Wednesday. The astronomers were able to differentiate between the two substances with a technique known as gravitational lensing in which dark matter appears in blue in the image while ordinary matter, which is mostly in the form of hot gas, looks pink. As the two clusters merged at speeds of millions of miles per hour, the hot gas in each cluster collided and slowed down, the astronomers said. The dark matter, however, did not. The separation between the pink and blue material provides direct evidence for dark matter and supports its particles interact with each other only very weakly or not all, apart from the pull of gravity, the astrononers said. AFP PHOTO/HO/ NASA, ESA, CXC, M. Bradac (University of California, Santa Barbara), and S. Allen (Stanford University)
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Detalii fotografie |
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--, SPACE |
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AFP / Mediafax Foto |
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HO |
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28 August 2008 |
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2667 x 2257 (1.05 MB) |
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