NASA is preparing to take one of the most detailed looks ever at our home galaxy, and it’s doing it with a powerful new observatory designed to see what visible-light telescopes often miss. The Nancy Grace Roman Space Telescope, currently at NASA’s Goddard Space Flight Center, will use infrared vision to peer through thick clouds of cosmic dust and reveal the Milky Way in extraordinary detail—potentially uncovering up to 20 billion stars.
The Milky Way is enormous, stretching more than 100,000 light-years across and packed with well over 100 billion stars. But there’s a major challenge: huge portions of the galaxy are hidden behind dust, especially along the crowded galactic plane where stars are most densely concentrated. Past efforts have made remarkable progress, but visible-light surveys can only go so far when dust blocks the view.
That’s where Roman is expected to make a dramatic difference. Unlike missions that primarily observed in visible light, Roman will survey the galaxy in infrared wavelengths, which can pass through dusty regions far more effectively. This capability could allow it to map and study vast numbers of stars that have been difficult—or impossible—to detect in traditional optical surveys.
Roman is currently scheduled to launch in May 2027, though NASA has indicated the mission could be ready earlier, potentially as soon as fall 2026 if preparations move quickly. The telescope’s primary mission is planned to last five years. During its first two years, Roman will tackle a major project focused specifically on our galaxy: the Galactic Plane Survey.
This Milky Way survey will cover about 700 square degrees along the bright band of the galactic plane—an area roughly comparable to 3,500 full moons spread across the sky. While the total observing time adds up to 29 days, the survey will be spaced out over two years to collect the depth and coverage scientists need.
The payoff could be huge. By producing an unprecedented infrared map of the Milky Way’s most dust-obscured and star-packed regions, Roman is expected to reveal new structures, previously hidden stellar populations, and finer details about how stars form and evolve. Scientists will also use the data to better understand how stars interact with their environments across the galaxy, offering new clues about the Milky Way’s history and ongoing evolution.
With Roman’s Galactic Plane Survey, NASA is aiming to open a clearer window into the busiest, most mysterious parts of our galaxy—turning regions once blurred by dust into a rich new landscape for discovery.
