Astronomers detect 10 billion-year-old radio waves from a distant galaxy cluster SpARCS1049, revealing a mini-halo that suggests black holes or cosmic collisions energize galaxies.

The 300,000 new galaxies were discovered as part of a study involving 200 scientists from 18 countries, using a Low-Frequency Array (LOFAR) telescope in the Netherlands.

A co-author, Cees Bassa from the Netherlands Institute for Radio Astronomy, said the LOFAR had detected radiation between 110 and 188 megahertz from 47 of the 68 satellites that were observed ...