NASA launched the Nancy Grace Roman Space Telescope Sunday morning from the Kennedy Space Center in Florida. The $4.3 billion observatory, which is approximately the size of a tour bus, lifted off at 7:26 a.m. ET aboard a SpaceX Falcon Heavy rocket. The mission is designed to spend five years surveying the cosmos to investigate the nature of dark matter and dark energy, while also searching for planets beyond our solar system.
The spacecraft is named after the late Nancy Grace Roman, NASA’s first chief astronomer and a central figure in the development of the Hubble Space Telescope. While Roman possesses the same image sharpness as Hubble, its field of view is at least 100 times larger, allowing it to capture expansive areas of the sky in a single image. The 42-foot-long, 18,000-pound telescope is now en route to the second Sun-Earth Lagrange point (L2), located approximately one million miles from Earth.
During its transit to L2, which is expected to take more than three months, mission teams will conduct calibrations and testing. "It's basically like our time to kick the tires and just make sure that the focus is right, the pointing is right," said Jeremy Perkins, a NASA integration and test scientist. Once operational, the telescope will collect 1.4 terabytes of raw science data daily, which NASA intends to make publicly available immediately through a cloud-based system called Roman Nexus.
For the public and academic sectors, the mission represents a change in how space data is distributed. Through the Roman Nexus system, raw data will be accessible to anyone, not just institutional researchers. This transparency is intended to facilitate "one-in-a-million" discoveries by allowing the broader public to analyze the 1.4 terabytes of data transmitted daily. The mission also tests new coronagraph technology designed to block starlight to directly image planets, a technical hurdle in the search for potentially habitable worlds.
The findings from Roman are expected to influence future astrophysical policy and cosmological models regarding the expansion of the universe. By cataloging Type Ia supernovae—often called "standard candles" for their predictable brightness—scientists hope to better understand the force known as dark energy. The telescope will also map dark matter by observing how its gravity affects light paths over vast distances. Following the three-month calibration period, the telescope will begin its primary five-year observation window at the L2 orbit, joining the James Webb Space Telescope already stationed there.