Radio galaxy image of neutral hydrogen in and around the NGC 4532 / DDO 137 using ASKAP. Credit: ICRAR Scientists at The University of Western Australia's node of the International Centre for Radio Astronomy Research (ICRAR) have made a remarkable discovery: a massive structure stretching about 185,000 light-years between two galaxies, NGC 4532 and DDO 137, located some 53 million light-years from Earth. According to a study published in the Monthly Notices of the Royal Astronomical Society ,