PASADENA, Calif. \u2013\u00a0In a new study, astronomers have revealed new details about how young stars shape their galactic surroundings.\u00a0<\/p>\n
Researchers analyzed about 18,000 star-forming regions in nearby spiral galaxies using data from powerful instruments like the James Webb Space Telescope<\/a>, Hubble Space Telescope<\/a> and the Atacama Large Millimeter\/submillimeter Array, <\/a>whose observations were made as part of the PHANGS survey<\/a> \u2014 a collaboration aimed at better understanding galactic evolution.\u00a0<\/p>\n They found that in normal galaxies, pressure from ionized gas drives the expansion of young star-forming regions. However, whether these zones continue to grow or remain stagnant is strongly dependent on their surrounding environment, said Debosmita Pathak,<\/a> lead author of the study and a graduate student in astronomy at The Ohio State University.<\/a><\/p>\n \u201cWhen young massive stars are born, they\u2019re very energetic and pump out a ton of photons into their surroundings,\u201d said Pathak. \u201cIn that process, they disrupt their local environments and start to drive interstellar material out of the area.\u201d<\/p>\n This mechanism, called stellar feedback, can influence galactic activity across many scales. \u00a0 Altering the evolution of dusty, cold gas in areas that are ripe for stellar birth can either trigger star formation or lead to the destruction of these star-forming regions.\u00a0<\/p>\n Such changes can also drive the chemical evolution of a galaxy, as chemical properties play a crucial role in both planet formation and in recording galactic history, said Pathak.\u00a0<\/p>\n \u201cThe Milky Way, for example, forms roughly one star per year, while more luminous infrared galaxies can produce stars at 100 times that rate,\u201d said Pathak. \u201cBut galaxies that have an abnormally high amount of stars typically underwent a more violent process to form, such as a major merger, where two galaxies collide.\u201d<\/p>\n The research was presented today (June 17, 2026) in a press conference at the 248th meeting of the American Astronomical Society (AAS) in Pasadena, California.<\/a> The AAS selected the findings to be featured in a press conference.\u00a0<\/p>\n To learn more about how young stars behave in these extremely dusty and turbulent environments, researchers compared the young stellar feedback pressures they found in normal star-forming galaxies against that of the incredibly bright starburst system NGC 3256,<\/a> a pair of massive galaxies located about 100 million light-years from Earth.\u00a0<\/p>\n Their results showed that the stellar feedback pressures there are about 100 times stronger than in other Milky Way-like spiral galaxies, meaning that while young, massive star clusters in the densest regions of the galaxy are confined by this intense pressure, most are likely super-powered enough to continue expanding.<\/p>\n Additionally, the high levels of turbulence researchers found in NGC 3256 are an indication that the gas within it is not settled in a simple flat disk, suggesting that the interplay between star formation and the usual conditions that precede it may be more unpredictable than in its normal, relatively stable galactic counterparts.<\/p>\n \u201cThese are pressure measurements that we haven\u2019t been able to make before, and they are quite different from what we\u2019ve seen in galaxies similar to the Milky Way,\u201d said Pathak. \u201cThis will allow us to benchmark the physical processes driving galactic evolution.\u201d\u00a0<\/p>\n The study\u2019s results have direct implications for understanding how star-forming regions evolve across many different cosmic settings, as well as how young stars help regulate and shape galactic evolution, even before high-powered blasts like supernovae<\/a> can occur.<\/p>\n \u201cIt\u2019s important to study environments in normal parts of the universe, but also how things deviate in the extremes,\u201d said Pathak. \u201cWithout this type of research, we wouldn\u2019t know if the physics that we\u2019re working with and the models that we\u2019re building actually hold true in such extreme places.\u201d<\/p>\n This summer, alongside the GOALS collaboration,<\/a> Pathak plans to continue their work measuring star formation in dusty environments as a visiting graduate student at IPAC at Caltech<\/a> in Pasadena. In advancing this work, Pathak expects their bright findings to inspire other insights in the scientific community.\u00a0<\/p>\n \u201cEvents like AAS are great places to get interdisciplinary collaboration work started,\u201d said Pathak. \u201cIt\u2019s also nice to see folks who are still interested in learning more about natural sciences, and get the word out that discovery is a very cool and fun thing to do.\u201d<\/p>\n \u00a0#<\/p>\n Contact: Debosmita Pathak, [email\u00a0protected]<\/a><\/p>\n