Tag

Cosmic Dawn

All articles tagged with #cosmic dawn

space12 hours ago•13 min saved

JWST Spots Crowded Galaxy Merger at Cosmic Dawn Enriching Surrounding Gas

JWST has imaged JWST’s Quintet, a merger of at least five galaxies at redshift ~6.7 (about 800 million years after the Big Bang), revealing a compact, clumpy system with ~17 galaxy-sized clumps, a combined star-formation rate around 255 solar masses per year, and a halo of oxygen-emitting gas (O III) and Hβ linking the galaxies. The presence of metal-enriched gas around the system shows heavy elements were already dispersed into the surrounding medium by intense interactions, implying the early universe was chemically mature and dynamically complex far earlier than some models predict and potentially related to the emergence of massive, quiescent galaxies later on.

via Space Daily|

#circumgalactic-medium #cosmic-dawn #galaxy-mergers

space6 days ago•12 min saved

SKA-Low Delivers Strong First Light With Only 1% of Antennas

In March 2025, SKA-Low produced its first image using 1,024 antennas out of 131,072, spotting 85 galaxies and exceeding expectations, proving the array’s design works and signaling far deeper surveys as hundreds of stations come online to enable the cosmic-dawn science.

via Space Daily|

#astronomy #cosmic-dawn #radio-astronomy

space29 days ago•6 min saved

Ancient Flickering Quasar Reveals Early Growth of Supermassive Black Holes

Astronomers report the discovery of J0439+1634, the oldest known flickering quasar, whose light has traveled more than 13 billion years to Earth, dating to the cosmic dawn when the Universe was about 850 million years old. The quasar appears to host a pancake-shaped, surprisingly mature accretion disk feeding a supermassive black hole over 600 million solar masses, making it extremely bright. Multi-wavelength data, including NEOWISE infrared observations, show irregular flickering driven by variable gas inflow, providing direct clues about early black hole growth and enabling new mass-measurement approaches. The study suggests growth processes seen in nearby quasars were already in place early on, and future facilities like the Vera C. Rubin Observatory and the Nancy Grace Roman Space Telescope will hunt for even earlier examples.

via ScienceAlert|

#accretion-disk #black-hole #cosmic-dawn

space1 month ago•10 min saved

Webb’s Early Galaxies Are Brighter and Earlier Than Expected, Rewriting Star-Formation Timelines

The James Webb Space Telescope has spectroscopically confirmed MoM-z14, the most distant galaxy yet at redshift about 14.44 (light from ~280 million years after the Big Bang), joining a growing population of UV-bright galaxies brighter and more common than pre‑Webb models predicted. This prompts a revision of how quickly the first galaxies formed stars, while cosmology remains intact; explanations include more efficient early star formation, bursty activity, top-heavy stellar populations, reduced dust, and contributions from accreting black holes. Ongoing and future spectroscopy will measure how common these galaxies are and improve chemical enrichment estimates, such as oxygen detection, to sharpen the picture of the early universe.

via Space Daily|

#cosmic-dawn #early-galaxies #james-webb-space-telescope

space3 months ago•6 min saved

Tiny Dwarfs, Big Light: Dwarf Galaxies Reionized the Early Universe

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.

via ScienceAlert|

#abell-2744 #cosmic-dawn #dwarf-galaxies

space5 months ago•78 min saved

JWST spots the universe’s most distant galaxy MoM-z14, challenging early-universe predictions

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.

via Space|

#cosmic-dawn #early-universe #high-redshift-galaxy

science5 months ago•9 min saved

Webb Reveals Young Black Holes Behind Red Dots

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.

via SciTechDaily|

#black-holes #cosmic-dawn #early-universe

science6 months ago•3 min saved

James Webb Space Telescope: A New Era in Cosmic Observation

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.

via Live Science|

#cosmic-dawn #exoplanets #infrared-imaging

science6 months ago•4 min saved

James Webb Telescope Spots Earliest Supernova in the Universe

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.

via Yahoo|

#cosmic-dawn #early-universe #gamma-ray-burst

science8 months ago•5 min saved

Webb Telescope Unveils the Turbulent Beginnings of the Universe's First Galaxies

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.

via Space|

#cosmic-dawn #early-galaxies #galaxy-formation

science9 months ago•4 min saved

Unveiling the Dawn of Time's First Light

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.

via ScienceAlert|

#cosmic-dawn #dwarf-galaxies #early-universe

science9 months ago•3 min saved

Early Stars Formed in a 'Pre-Heated' Universe, Study Finds

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.

via ScienceAlert|

#cosmic-dawn #epoch-of-reionization #pre-heated

science10 months ago•6 min saved

Astronomers Discover Hidden Supermassive Black Holes from Cosmic Dawn

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.

via Space|

#black-holes #cosmic-dawn #jwst

science10 months ago•10 min saved

NASA's Telescopes Offer New Insights into Interstellar Comet 3I/ATLAS

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.

via Space|

#comet-3iatlas #cosmic-dawn #interstellar

science10 months ago•6 min saved

James Webb Telescope Discovers 300 Mysterious Early Universe Galaxies

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.

via Phys.org|

#cosmic-dawn #early-universe #galaxy-formation