Skywatch

  • June 28, 2007

    Episode 106: Ring Around the Galaxies

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    Shownotes

    What happens when astronomers go on the hunt for dark matter with the Hubble Space Telescope? They find some unusual configurations. Recently astronomers reported that observations with the Advanced Camera for Surveys suggested that a ring of the mysterious dark matter exists in a cluster of galaxies. This had never been seen before, and the surprised researchers thought maybe something was wrong with the data analysis. After scrutiny, it appeared a collision of two galaxy clusters shaped dark matter into a ring, like ripples in a pond after a stone is thrown in.