Galaxies, Galaxies Everywhere

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This sensitive, wide-field LOFAR image at 150 MHz contains more than 5,000 radio sources in an area of the sky that is about ten times the size of the full moon. The majority of the sources are galaxies containing an active black hole producing jets of relativistic particles. Credit: Wendy Williams (Leiden), Reinout van Weeren (Harvard) and Huub Rottgering (Leiden).