All articles tagged with #cosmic dawn
New JWST and Hubble observations reveal ultra-faint dwarf galaxies were the primary engines of cosmic reionization, outnumbering large galaxies 100 to 1 and collectively emitting enough ionizing radiation to turn neutral hydrogen into ionized gas, effectively lighting up the early Universe by about a billion years after the Big Bang.
NASA’s James Webb Space Telescope has detected MoM-z14, the farthest galaxy observed to date, about 13.5 billion years back (roughly 280 million years after the Big Bang). The galaxy is brighter, more compact, and chemically enriched than expected for such an early epoch, challenging existing models of early star and galaxy formation and suggesting the early universe may have evolved more rapidly than theories predicted.
New analysis of James Webb Space Telescope images shows the universe’s “little red dots” are not distant galaxies but young, enshrouded black holes (up to ~10 million solar masses) rapidly accreting gas in dense cocoons. The heat from infalling material glows through the cocoon, producing the red hue. Hundreds have been identified, offering clues to how supermassive black holes could form within the first 700 million years after the Big Bang. The findings, published in Nature on Jan 14, 2026 by the Cosmic Dawn Centre at the University of Copenhagen, describe these “messy eaters” that grow quickly while pushing away much of the incoming gas.
Launched on December 25, 2021, the James Webb Space Telescope has significantly advanced our understanding of the universe by capturing detailed images of the early cosmos, confirming existing theories, and raising new questions about cosmic evolution, exoplanets, and black holes, despite initial delays and budget overruns.
Scientists using the James Webb Space Telescope may have discovered the earliest supernova in the universe, occurring just 730 million years after the Big Bang, providing new insights into early star and galaxy evolution, and potentially marking the most distant supernova observed to date.
A study using the James Webb Space Telescope reveals that the universe's earliest galaxies were chaotic and turbulent, with irregular gas flows and intense star formation, before settling into the more structured galaxies we observe today.
Recent observations from the Hubble and James Webb Space Telescopes suggest that small dwarf galaxies played a crucial role in illuminating the early Universe during cosmic reionization, challenging previous assumptions that larger galaxies and black holes were the primary sources of ionizing radiation. This discovery highlights the importance of low-mass galaxies in shaping the Universe's evolution and opens new avenues for understanding our cosmic origins.
A new study suggests the early universe was 'pre-heated' before the Epoch of Reionization, challenging previous assumptions of an ultracold beginning, likely due to X-ray emissions from early black holes and stellar remnants, with ongoing radio telescope efforts to detect signals from this era.
Using the Subaru Telescope and the James Webb Space Telescope, astronomers discovered seven dust-shrouded supermassive black hole-powered quasars from when the universe was less than a billion years old, suggesting that such quasars may be twice as common during Cosmic Dawn as previously thought.
Scientists are exploring the possibility of using spacecraft to observe and study interstellar comet 3I/ATLAS as it passes the sun, offering a rare opportunity to analyze material from an ancient star system formed over 7 billion years ago, which could provide insights into the early universe. The comet's perihelion will occur behind the sun from Earth's perspective, making Earth-based observations difficult, but spacecraft like JUICE, Psyche, and those orbiting Mars could capture valuable data and possibly collect material from its tail, marking a unique scientific opportunity.
The MINERVA program utilizing the James Webb Space Telescope aims to enhance our understanding of the early universe by capturing detailed images of the first galaxies, stars, and black holes, especially during the cosmic dawn, through advanced medium-band imaging techniques that allow for more precise analysis of distant, dust-obscured objects.
Astronomers discovered an oxygen-rich galaxy, JADES-GS-z11-0, just 400 million years after the Big Bang, suggesting that multiple generations of stars and possibly early life could have developed sooner than previously thought, challenging current understanding of galaxy evolution and the timeline for life in the universe.
A new theoretical model proposed by Jonathan Tan suggests that supermassive black holes formed from the remnants of the earliest stars, potentially revolutionizing our understanding of black hole origins and the Epoch of Reionization, supported by recent Webb observations of early black hole seeds and bright galaxies.
Astronomers using ALMA have detected oxygen in the distant galaxy JADES-GS-z14-0, which existed just 300 million years after the Big Bang, challenging existing models of galaxy formation and chemical enrichment timelines.
Astronomers propose that the mysterious 'little red dots' observed in the early universe are formed in very slowly spinning dark matter halos, which create extremely compact galaxies, explaining their unique properties and rarity during the cosmic dawn.