Tag: reionization
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Probing Ionized Bubbles Around Luminous Sources During Reionization with SKA 21-cm Observations
Introduction The era of cosmic reionization marks a pivotal chapter in the Universe’s history, when the first luminous sources began to ionize the surrounding hydrogen gas. Detecting and characterizing the resulting ionized bubbles provide critical insights into the nature of early galaxies, the timeline of reionization, and the physics driving structure formation. Recent work focuses…
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Probing ionized bubbles around luminous sources during reionization with SKA 21-cm observations
Introduction: Mapping the dawn of the universe The epoch of reionization marks a pivotal phase in cosmic history when the first luminous sources transformed the cold, neutral hydrogen fog into a tapestry of ionized regions. Understanding the size, distribution, and growth of these ionized bubbles around early galaxies and quasars is essential for piecing together…
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What are dark stars? How they could solve three cosmic mysteries
What are dark stars? Dark stars are a theoretical idea proposed to explain how the first generations of luminous objects in the universe formed during cosmic dawn. Unlike ordinary stars powered by nuclear fusion, these hypothetical stars would be energized in part by the annihilation of dark matter particles in their cores. This extra energy…
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Dark Stars: A Cut-Above Theory Explaining 3 Cosmic Dawn Mysteries
What are dark stars? Dark stars are a theoretical type of early star that could ignite not only by nuclear fusion but also with a glow powered by dark matter. In some models, pairs of dark matter particles annihilate inside a forming star, releasing heat that sustains luminosity even as ordinary fuel wavers. While not…
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Dwarf Galaxies Finally Lit the Cosmic Dawn: How Tiny Powers Shaped the Universe
The Dawn Finally Lights Up: Dwarf Galaxies Take Center Stage For decades, scientists have wondered what brightened the early Universe during the cosmic dawn. New evidence suggests the unlikely culprits were ultra-faint, low-mass dwarf galaxies that flickered into life and cleared away the cold, murky hydrogen fog of intergalactic space. Using a powerful combination of…
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How the Lights Were Switched On at the Cosmic Dawn: Dwarf Galaxies as the Hidden Fireflies
The Spark That Shaped the Early Universe For decades, scientists have wondered what finally lifted the Universe out of its fog of neutral hydrogen during the cosmic dawn. A new wave of observations from the Hubble Space Telescope and the James Webb Space Telescope suggests the answer lies in the smallest galaxies imaginable: ultra-faint dwarf…
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We Finally Know How The Lights Switched on at The Dawn of Time
The Revelation: Dwarf Galaxies as the Key to Cosmic Reionization In a landmark finding that reshapes our understanding of the early universe, astronomers using the Hubble and James Webb Space Telescopes have traced the lights of the cosmic dawn to tiny, ultra-faint dwarf galaxies. These diminutive galaxies appeared in the first billion years after the…