NASA's Nancy Grace Roman Space Telescope, assembled eight months ahead of schedule and under budget, stands ready for its September launch. The observatory has an unusual origin, built from repurposed spy satellite hardware provided by the National Reconnaissance Office in 2012. This unexpected gift nearly doubled the telescope's size from the original 1.5-meter design, requiring NASA to scale up supporting hardware while gaining higher resolution imaging capabilities.

Roman will capture approximately 1.4 terabytes of data daily, thanks to its Wide Field Instrument with a view 100 times wider than Hubble's. The telescope carries just two instruments: its wide-field imager and a coronagraph designed to directly image exoplanets by blocking out starlight. This simplicity contrasts with complex observatories like Webb, featuring minimal moving parts that deploy shortly after launch.

The mission focuses on studying baryon acoustic oscillations to understand dark matter and dark energy, conducting microlensing surveys to detect thousands of exoplanets—including potential rogue planets—and directly imaging exoplanets in distant orbits. Its infrared capabilities will help astronomers observe phenomena like the earliest galaxies and exoplanet atmospheres, which are largely invisible at other wavelengths. Commissioning requires only 90 days, and the telescope carries enough fuel for at least a decade of operation.