Scientists using the Murchison Widefield Array in Australia analyzed nine years of radio data to study the elusive 21-cm hydrogen signal from the universe’s dark ages. Their findings suggest early black holes and stars had already heated cosmic gas, marking the first observational evidence of this warming phase.Scientists using the Murchison Widefield Array in Australia analyzed nine years of radio data to study the elusive 21-cm hydrogen signal from the universe’s dark ages. Their findings suggest early black holes and stars had already heated cosmic gas, marking the first observational evidence of this warming phase.
