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Astronomy magazine podcast: Dark matter

Rick White explains how he and his team used the Hubble Space Telescope to acquire the most convincing evidence of dark matter's existence to date.
ZwCl0024+1652
This Hubble Space Telescope composite image shows a ghostly "ring" of dark matter in the galaxy cluster ZwCl0024+1652.
NASA, ESA, M.J. Jee and H. Ford (Johns Hopkins University)
May 17, 2007
An international team of astronomers using the Hubble Space Telescope has discovered a ghostly ring of dark matter that was formed long ago during a titanic collision between two massive galaxy clusters. It is the first time that a dark matter distribution has been found that differs substantially from the distribution of ordinary matter.

Team member Rick White explains what Hubble revealed and how it will influence future studies of dark matter.

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