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.
Using the James Webb Space Telescope (JWST), astronomers from Canada and Switzerland have discovered a new galaxy, which received designation COSMOS2020-635829. The newfound object appears to undergo a ram pressure stripping ...
Using NASA's Chandra spacecraft and ESA's XMM-Newton satellite, astronomers have investigated the galaxy NGC 7793, searching for supernova remnants (SNRs). As a result, they discovered four new X-ray SNRs in this galaxy. ...
Scientists using NASA's James Webb Space Telescope (JWST) have made an exciting discovery about the early universe. They found dozens of small galaxies that played a huge role in transforming our cosmos from a dark, foggy ...
Astronomy
Jun 16, 2025
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This serene spiral galaxy hides a cataclysmic past. The galaxy IC 758, shown in this NASA/ESA Hubble Space Telescope image, is situated 60 million light-years away in the constellation Ursa Major.
Astronomy
Jun 16, 2025
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Astronomers have discovered a "jellyfish" galaxy whose unusual shape and internal mechanisms—including distinctive "bunny ears" and an inner "tail"—are giving researchers an unprecedented view of dynamics within one of the ...
Astronomy
Jun 12, 2025
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Dark matter affects how stars move within galaxies, how galaxies build up over time, and how everything in the universe is held together—but no existing tool has directly detected it. While dark matter does not reflect, absorb, ...
Astronomy
Jun 12, 2025
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Astronomers have surveyed massive, dense star factories, unlike any found in the Milky Way, in a large number of galaxies across the local universe. The findings provide a rare glimpse into processes shaping galaxies in the ...
Astronomy
Jun 11, 2025
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Astronomers using data from NASA's James Webb Space Telescope have identified dozens of small galaxies that played a starring role in a cosmic makeover that transformed the early universe into the one we know today.
Astronomy
Jun 11, 2025
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Astronomers have discovered the largest known cloud of energetic particles surrounding a galaxy cluster—spanning nearly 20 million light-years. The finding challenges long-standing theories about how particles stay energized ...
Astronomy
Jun 10, 2025
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Dr. Sukanya Chakrabarti, the Pei-Ling Chan Endowed Chair at The University of Alabama in Huntsville (UAH), a part of The University of Alabama System, has co-authored a paper that uses young stars to develop a more accurate ...
Astronomy
Jun 10, 2025
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