Galaxies are gravitationally bound, large-scale astrophysical systems composed primarily of dark matter, stars, stellar remnants, gas, and dust, often embedded in extended dark matter halos. They exhibit diverse morphologies, including spiral, elliptical, and irregular types, and span mass scales from roughly 10⁷ to over 10¹² solar masses. Their internal dynamics are governed by gravity and angular momentum distribution, with baryonic components organized into disks, bulges, and halos, and frequently hosting central supermassive black holes. Galaxies are fundamental units of cosmic structure formation, participating in hierarchical assembly, mergers, and interactions within larger environments such as groups, clusters, and filaments of the cosmic web.
Researchers from The University of Western Australia node at the International Centre for Radio Astronomy Research (ICRAR) have uncovered an immense structure, which spans an astonishing 185,000 light-years between galaxies ...
Astronomy
Sep 24, 2025
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An international team of astronomers has performed photometric and spectroscopic observations of a compact stellar system around a nearby spiral galaxy known as NGC 7531. Results of the observational campaign, published September ...
This NASA/ESA Hubble Space Telescope image reveals new details in Messier 82 (M82), home to brilliant stars whose light is shaded by sculptural clouds made of clumps and streaks of dust and gas. This image features the star-powered ...
Astronomy
Sep 22, 2025
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A Rutgers-led team of scientists has uncovered evidence of how galaxies expand by tracing the invisible scaffolding of the universe created by a mysterious substance known as dark matter.
Astronomy
Sep 18, 2025
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Using the wide-field survey capabilities of the Subaru Telescope, astronomers discovered active supermassive black holes, or quasars, in the distant universe and then studied them with the James Webb Space Telescope (JWST). ...
Astronomy
Sep 18, 2025
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NASA's Nancy Grace Roman Space Telescope will help scientists better understand our Milky Way galaxy's less sparkly components—gas and dust strewn between stars, known as the interstellar medium.
Astronomy
Sep 16, 2025
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If you think a galaxy is big, compare it to the size of the universe: it's just a tiny dot which, together with a huge number of other tiny dots, forms clusters that aggregate into superclusters, which in turn weave into ...
Astronomy
Sep 16, 2025
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Tiny red objects spotted by NASA's James Webb Space Telescope (JWST) are offering scientists new insights into the origins of galaxies in the universe—and may represent an entirely new class of celestial object: a black hole ...
Astronomy
Sep 12, 2025
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While it may appear as just another spiral galaxy among billions in the universe, this image from the NASA/ESA Hubble Space Telescope reveals a galaxy with plenty to study. The galaxy, NGC 7456, is located over 51 million ...
Astronomy
Sep 6, 2025
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What was the universe like in the first few hundreds of millions of years after it came into existence? How did the first stars and galaxies form? Those are questions that astronomers now have a better chance of answering, ...
Astronomy
Sep 1, 2025
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