Galaxy disks as a research area focuses on the structure, dynamics, formation, and evolution of the flattened, rotationally supported components of galaxies, particularly spiral and lenticular systems. Studies address stellar and gas kinematics, angular momentum distribution, and the interplay between baryons and dark matter in shaping disk profiles (e.g., exponential or broken-exponential). The field investigates disk instabilities, spiral arms, bars, secular evolution, star formation regulation, radial migration, and vertical thickening, often using multiwavelength observations, integral-field spectroscopy, and cosmological simulations. Galaxy disk research is central to constraining galaxy assembly histories, feedback processes, and the coupling between galactic disks, halos, and their broader cosmological environment.
Astronomers have found a vast reservoir of hydrogen with something conspicuously missing: detectable starlight. The object, called AGC 322753, contains roughly 2 billion times the sun's mass in neutral hydrogen, a potential ...
The Milky Way is home to hundreds of billions of stars arranged in a glorious spiral pattern. But beyond the obvious spiral, our galaxy has other physical characteristics. It's divided into a galactic bulge, a galactic disk ...
Astronomy
Oct 25, 2026
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Astronomers have discovered a faint population of young stars extending far beyond the known edge of the nearby spiral galaxy Messier 74. The finding suggests the galaxy is nearly twice as large as previously measured. The ...
Though the spiral galaxy in this new image from the NASA/ESA Hubble Space Telescope seems serene, it hides a chaotic secret. This galaxy is NGC 4698, and it lies about 55 million light-years away in the constellation Virgo. ...
Astronomy
Sep 18, 2026
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Most of the stars in our Milky Way galaxy sit neatly on a flat plane. But the space around our galaxy is much more chaotic. Rogue bands of stars called "stellar streams" orbit the Milky Way much like planets in our solar ...
Astronomy
Aug 27, 2026
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Amina Helmi's passion for the Milky Way is clear as soon as one steps into her small office at the University of Groningen, in the north of the Netherlands.
Astronomy
Jul 30, 2026
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A new study using data from NASA's Hubble Space Telescope finds that star formation in the nearby Andromeda galaxy has undergone a 500-million-year decline, with an even steeper drop in the last 40 million years. Andromeda, ...
Astronomy
Jul 27, 2026
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The Whirlpool galaxy (M51) is a classic grand spiral galaxy. It was the first object identified as a spiral, way back in 1845. At the time, it and other galaxies were considered spiral nebulae, since astronomers didn't know ...
Astronomy
Jul 22, 2026
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The Milky Way may have undergone a dramatic change in orientation during its history, according to new research that helps explain a long-standing mystery about our galaxy. Using supercomputer simulations of galaxies like ...
Astronomy
Jul 21, 2026
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Peak star formation took place during cosmic noon, between 2–3 billion years after the Big Bang. The star formation rate (SFR) back then was up to 100 times greater than it is today. For the SFR to be so high, gas had to ...
Astronomy
Jul 15, 2026
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