Tag: cosmic history
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Ancient Dead Galaxy Revealed: Starvation Fuelled by a Supermassive Black Hole
Introduction: A Glimpse into the Early Universe’s Quiet Giants In a breakthrough study, researchers using the James Webb Space Telescope (JWST) have identified what may be among the earliest known “dead” galaxies. These ancient systems, which stopped forming stars very early in cosmic history, offer crucial clues about how massive galaxies halt their growth. The…
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Pacific Be-10 Spike Suggests Nearby Ancient Supernova
Overview: A surprising isotopic signal in Pacific sediments Scientists have identified an unusual spike in the radioactive isotope beryllium-10 (Be-10) in ocean sediments from the Pacific Ocean. Because Be-10 forms when cosmic rays strike Earth’s atmosphere, such a spike can act as a cosmic fingerprint, potentially recording a nearby stellar explosion in Earth’s distant past.…
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A Single, ‘Naked’ Black Hole Rewrites the History of the Universe
Introduction to the Discovery In an extraordinary discovery, astronomers have identified a black hole that defies conventional understanding—a solitary, massive, ‘naked’ black hole situated in the early universe. This approximately 1.5 billion solar masses black hole stands as a testament to the universe’s enigmatic origins and offers a fresh perspective on its formation. What is…