Dark matter evidence from the ROSAT satellite

Dark matter evidence from the ROSAT satellite

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This image is part of the feature Dark Matter Mine
This image is part of the feature The X-Ray Sky

Credit: NASA/SCIENCE PHOTO LIBRARY

Caption: Dark matter evidence. Composite image showing the cluster of galaxies NGC 2300 (seen at optical wavelengths) and the recently discovered cloud of gas (magenta, in X-ray emission) in which the galaxies are embedded. The image of the gas cloud was taken by the ROSAT X-ray satellite and is considered to be strong evidence for the presence of dark matter - dark because it does not emit detectable radiation. The cloud is formed by hot gas which has a temperature of about 10 million Kelvin. The gravitational pull of the cluster is not enough to hold such a cloud together. Some astronomers have suggested that it is dark matter that prevents the cloud from dispersing in space.

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Keywords: astronomy, cluster, cluster of galaxies, cosmology, dark matter, dark matter evidenc, dark matter evidence, evidence of, galactic, galaxies, galaxy, galaxy cluster, group, ngc 2300, rosat imagery, science, universe

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