Galaxy dark matter halos as a research area focuses on the structure, composition, and dynamical role of extended, non-luminous mass distributions surrounding galaxies, investigated primarily through gravitational effects such as rotation curves, strong and weak lensing, satellite kinematics, and large-scale structure. This field addresses halo density profiles, concentration–mass relations, subhalo populations, and their dependence on cosmological parameters and dark matter models (e.g., cold vs. warm). It also studies baryon–halo interactions, including feedback-driven core formation, galaxy–halo connection (abundance matching, halo occupation), and the impact of halos on galaxy formation, evolution, and environmental processes within the cosmological context.
We may be more in the dark about dark matter than previously thought, according to a new analysis of distant galaxy clusters. Yale astrophysicist Priyamvada Natarajan, a leading theorist on the nature of black holes and dark ...
Astronomy
May 14, 2026
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Astronomers who simulate galaxies do not always get the same result, even when they start from identical conditions. New research from Leiden University shows that this is not a flaw, but a consequence of how galaxies behave—and ...
Astronomy
May 11, 2026
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Our most massive satellite galaxy, the Large Magellanic Cloud (LMC), has been the center of a heated debate in the astrophysics community over the last few years. That debate centers on whether this is the LMC's first or ...
Astronomy
May 4, 2026
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Ultra-faint dwarf galaxies—tiny satellite galaxies orbiting the Milky Way—have long been seen as cosmic fossils. Now, a new study published today in Monthly Notices of the Royal Astronomical Society uses an unprecedented ...
Astronomy
Apr 23, 2026
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The universe has a hidden structure, and a University of Virginia professor is mapping it in 3D, using 46 million galaxies and quasars and 19 million stars. Satya Gontcho A Gontcho, an assistant professor in the Department ...
Astronomy
Apr 21, 2026
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European astronomers have used the Atacama Large Millimeter Array (ALMA) and the James Webb Space Telescope (JWST) to observe a recently discovered giant disk galaxy known as ADF22.1. Results of the new observations, published ...
The launch of NASA's James Webb Space Telescope (JWST) in 2021 pushed the horizon of seeing the early universe, unveiling cosmic events just a few hundred million years after the Big Bang. Among the most striking discoveries ...
Astronomy
Apr 16, 2026
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The absence of a signal could itself be a signal. This is the idea behind a new study published in the Journal of Cosmology and Astroparticle Physics, which aims to redefine how we search for dark matter, showing that it ...
Astronomy
Apr 9, 2026
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Astronomers have long argued that dark matter is the invisible scaffolding that holds galaxies together. Without its immense gravitational pull, the rotational spins of galaxies would force them to simply fly apart. But now, ...
Astronomy
Apr 2, 2026
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Our Milky Way's halo of hot gas is warmer to the "south" than the "north" because of an internal combustion engine-like effect that is compressing the gas like a piston, a new study has found. Computer simulations reveal ...
Astronomy
Mar 26, 2026
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