Set of radio galaxies (IMAGE) Faculty of Sciences of the University of Lisbon Caption Set of radio galaxies – galaxies with significant emission in radio frequencies – observed with the LOFAR radio telescope, superimposed on the same region of the sky in visible light. The extent of the radio emission is evident, which is distinct from the visible part of the galaxy. These are some of the galaxies used in the training of the machine learning algorithm developed by this research team. Credit Judith Croston and the LOFAR surveys team Usage Restrictions Attribution is required. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.