An international team of astronomers has just presented a very different map of the sky. Take a close look at the photograph above. They look like stars, but what you actually see are 25,000 supermassive black holes. The map, published in the latest issue of 'Astronomy & Astrophysics', is the most detailed map available in the low radio frequency range. To achieve this, the astronomers used 52 stations equipped with low-frequency antennas (all part of the Low Frequency Array (LOFAR) radio telescope network), distributed across nine different European countries. Currently, LOFAR is the only radio telescope network capable of obtaining deep, high-resolution images at frequencies below 100 MHz. See more
