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08 October 2008
'Cosmic Eye' Helps Focus on Distant Galaxy's Formation
Using gravitational lensing, astronomers have been able to see a young star-forming galaxy in the distant universe as it appeared only two billion years after the Big Bang. Appropriately enough, the galaxy used as a zoom lens was the "Cosmic Eye" galaxy, named so because through the effect of gravitational lensing, it looks like [...]
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27 August 2008
Clash of Clusters Separates Dark Matter From Ordinary Matter
A powerful collision of galaxy clusters captured by NASA's Hubble Space Telescope and Chandra X-ray Observatory provides evidence for dark matter and insight into its properties. Observations of the cluster known as MACS J0025.4-1222 indicate that a titanic collision has separated dark matter from ordinary matter. The images also provide an independent confirmation of [...]
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21 July 2008
Hubble Survey of Gravitational Lenses Yields Measure of Dark Matter in Distant Galaxies
An international team of astronomers have compiled the largest-ever single collection of "gravitational lens" galaxies, and their survey yielded information on the masses of galaxies, including an inference of the amount of dark matter. Gravitational lensing occurs when two galaxies happen to aligned with one another along our line of sight in the sky. [...]
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