ALMA Composite Reveals 650‑Light‑Year Gas Swath On 25 February 2026 the Atacama Large Millimeter/submillimeter Array in Chile released the largest stitched‑together image ever produced by the facility, mapping a cold‑gas region that spans more than 650 light‑years across the Galactic Center [1]. The observation focuses on the Milky Way’s Central Molecular Zone, a dense reservoir of star‑forming material previously unresolved at this scale [1]. The image was assembled from data collected by the full array of ALMA antennas, taking advantage of the desert’s exceptionally dry atmosphere [1].

Gas and Dust Encircle Sagittarius A* Black Hole – The new picture shows extensive clouds of gas and dust orbiting the galaxy’s central supermassive black hole, Sagittarius A*, highlighting the extreme physical conditions that dominate the region [1]. Researchers note that the zone is “a place of extremes, invisible to our eyes, but now revealed in extraordinary detail,” underscoring the unprecedented clarity of the millimeter‑wave view [1]. These structures provide a direct view of the material feeding and interacting with the black hole, a key component of Galactic dynamics [1].

Scientists Anticipate New Insights Into Galactic Evolution Survey leader Steve Longmore of Liverpool John Moores University states that analyzing star birth within this detailed map will improve understanding of how galaxies evolve over cosmic time [1]. European Southern Observatory astronomer Ashley Barnes emphasizes that the region’s extreme environment offers a natural laboratory for testing theories of star formation under high pressure and turbulence [1]. The data set is expected to feed multiple follow‑up studies, potentially reshaping models of the Milky Way’s past and future development [1].