The discovery of the oldest quasar ever seen, shining with the light of a trillion suns, is a groundbreaking achievement in astronomy. This remarkable find, made using the European Space Agency's Euclid space telescope, has revealed a treasure trove of 31 black-hole-powered quasars in the early universe. Among these, the most ancient and distant quasar, dating back just 670 million years after the Big Bang, is a testament to the power of modern telescopes and our understanding of the cosmos. This discovery not only showcases the brilliance of Euclid but also opens up new avenues for research, offering a unique opportunity to study the epoch of reionization, a pivotal period in the universe's history. The quasars, with their immense brightness, provide a glimpse into the formation and growth of supermassive black holes, shedding light on one of the greatest mysteries in astrophysics. The Euclid Wide Survey, covering one-third of the total sky, holds the promise of unraveling the secrets of the 'dark universe', including the enigmatic dark energy and the elusive dark matter. This discovery is a significant step forward in our quest to understand the early universe and the fundamental nature of these fascinating objects.
