Hubblecast 05: Hubble discovers ring of dark matter 

An international team of astronomers using the NASA/ESA Hubble Space Telescope has discovered a ghostly ring of dark matter formed long ago during a colossal collision between two galaxy clusters. This is the first time that dark matter has been found with a distribution that differs substantially from the distribution of ordinary matter.
Hubblecast is a free service produces by the ESA/Hubble at the European Southern Observatory in Germany.
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