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    • Galaxy cluster Abell 3667 with labels.
    Rights: Dr. Melanie Johnston-Hollitt Published 1 April 2009 Size: 220 KB Referencing Hub media

    Hot gas at the centre of the galaxy cluster gives off X-rays. Galaxies show as small radio emissions. The large areas of radio emissions are shock waves of two galaxy clusters colliding.

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      Colliding galaxies

      The 100 billion galaxies in the universe are not just scattered randomly in space. Most galaxies are arranged in small groups or larger clusters. What is a galaxy cluster? Galaxy clusters are the ...

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