Webb Discovers One of the Universe's First Galaxies
https://atlas.whatip.xyz/post.php?slug=webb-discovers-one-of-the-universes-first-galaxies<p>Astronomers using the James Webb Space Telescope have identified an ultra-faint galaxy seen just 800
#astronomers #discovers #universe #galaxies
Webb Discovers One of the Universe's First Galaxies
Astronomers using the James Webb Space Telescope have identified an ultra-faint galaxy seen just 800 million years after the Big Bang. The galaxy contains almost no heavy elements, shows signs of inte...
Peculiar velocities at low Galactic latitude
The Laniakea Supercluster is the closest large scale structure of galaxies. Is such a structure expected in the standard cold dark matter model of cosmology? This would be a relatively simple question to answer, were it not for the fact that the Zone of Avoidance (ZOA) runs right through it. Recent improvements to this paucity of data in the innermost ZOA can be made from systematic 21 cm surveys using the MeerKAT telescope (e.g. Kraan-Korteweg et al. 2024), and implementing these HI-redshifts as an extension to the CosmicFlows4 database for reconstruction (Hollinger et al. 2026). In this paper we test the assumption that for the purpose of reconstruction, additional HI detected galaxies without peculiar velocity determinations could be placed at their Hubble distances. We present infrared photometry of 163 of these in HI detected MeerKAT ZOA galaxies, in addition to 2MASS Extended Sources in the ZOA to determine their peculiar velocities. Averaging these peculiar velocities into redshift bins, we find that peculiar velocity corrections in the Laniakea Supercluster ZoA region are not prohibitively large, and that one can proceed with its reconstruction using the copious redshift data now available.
The Growth of Dust in
#Galaxies in the First Billion Years with Applications to Blue Monsters:
https://arxiv.org/abs/2509.18266 -> Where Did All This Dust Come From?
https://astrobites.org/2026/05/20/high-z-dust-accretion/
The Growth of Dust in Galaxies in the First Billion Years with Applications to Blue Monsters
A combination of JWST observations at z~12-14 and ALMA observations of extremely dust-rich systems at z~6 has demonstrated that dust grows extremely fast in the early Universe, with galaxies amassing up to 10^7 Msun of dust in just 500 Myr between z=12->6. In this paper we demonstrate, via a series of numerical experiments conducted in cosmological zoom-in simulations, that a likely pathway for this dust accumulation in the first formed galaxies is through production at early times via supernovae, followed by the rapid growth on ultrasmall dust grains. Our main results follow. The stellar production of dust dominates until z ~ 10-11 at which point galaxies transition to a growth-dominated regime. We employ a Shapley analysis to demonstrate that the local density is the dominant factor driving dust growth, followed by the grain size distribution. A rapid rise in the small-to-large grain ratio with decreasing redshift (owing to grain-grain shattering) drives growth through increased dust surface area per unit mass. Growth models are necessary to match the dust content of ALMA detected sources at z ~ 6. Finally, we demonstrate that ``blue monsters'', massive, UV-bright galaxies at $z>10$ with extremely blue continuum slopes likely have dust-to stellar mass ratios 10^-4-10^-3, but their top-heavy grain size distributions render them optically thin in the UV, providing a natural explanation for their observed properties without requiring exotic dust geometries.
The James Webb Space Telescope has found galaxies that appear to have formed within 280 million years of the Big Bang, some containing heavy elements that shouldn’t have had time to form — and at least one peer-reviewed paper has now proposed that the universe might actually be 26.7 billion years old, almost twice the standard estimate
https://atlas.whatip.xyz/post.php?slug=the-james-webb-space-telescope-has-found-galaxies-that-appear-to-have-formed-within-280-million-years-of-the-big-bang-some-containing-heavy-elements-that-shouldnt-have-had-time-to-form-and-at-least-one-peer-reviewed-paper-has-now-proposed-that-the-universe-might-actually-be-267-billion-years-old-almost-twice-the-standard-estimate<p>The James Webb Space Telescope wasn’t supposed to find any of this
#telescope #galaxies #james #spaceNews & Articles
Artemis Hub — NASA Artemis mission tracker, lunar exploration news, and 3I/ATLAS interstellar comet coverage
The James Webb Space Telescope is currently observing galaxies that formed 13 billion years ago, and several of them shouldn't exist according to the model cosm
https://atlas.whatip.xyz/post.php?slug=the-james-webb-space-telescope-is-currently-observing-galaxies-that-formed-13-billion-years-ago-and-several-of-them-shouldnt-exist-according-to-the-model-cosm<p>The James Webb Space Telescope is currently observing galaxies that formed 13 billion years ago
#telescope #currently #observing #galaxiesThe James Webb Space Telescope is currently observing galaxies that formed 13 billion years ago, and several of them shouldn't exist according to the model cosm
The James Webb Space Telescope is currently observing galaxies that formed 13 billion years ago, and several of them shouldn't exist according to the model cosmologists were using when Webb launc...
Galactic Butterfly Effect! Even a Single Star Can Dramatically Change a Galaxy - YouTube
https://www.youtube.com/watch?v=s-zsHrc2NHg
#Astronomy #Cosmology #Galaxies
Galactic Butterfly Effect! Even a Single Star Can Dramatically Change a Galaxy
The James Webb Space Telescope is currently observing galaxies that formed 13 billion years ago, and several of them shouldn’t exist according to the model cosmologists were using when Webb launched
JWST was launched to test a cosmological model, and within its first two years of operation, it began returning observations that the model in its standard form cannot accommodate.
The post The James ...
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