Astronomers Catch the Glowing Shockwave of a Galaxy on the Move

Astronomers have discovered a galaxy so unlike anything in the textbooks that the researcher who found it, after 25 years studying these objects, says he has never seen its equal. Named RAD-BAARG, it is falling supersonically into a distant cluster of galaxies and ploughing up a glowing arc of radio plasma nearly 1.8 million light years across, shaped uncannily like a bow and arrow. It offers astronomers their clearest view yet of a bow shock, a structure long predicted but…

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