A massive cosmic eye is being assembled from millions of tiny parts
NASA's Nancy Grace Roman Space Telescope has reached a major milestone. While it shares the same resolution as Hubble, its field of view is 100 times larger, promising to reveal hundreds of millions of stars and billions of galaxies in its first five years.
The assembly of the Roman observatory is a massive engineering feat involving over a thousand specialists and millions of individual components. At the heart of the spacecraft is the Optical Telescope Assembly, which features a 7.9-foot (2.4-meter) primary mirror. While this mirror is the same size as Hubble's, it is remarkably lighter, weighing only about 410 pounds (186 kilograms) due to modern technological advancements. This primary mirror, which was constructed by L3Harris Technologies in Rochester, New York, works alongside secondary mirrors to focus light into two distinct science instruments.
The telescope utilizes infrared light to peer through cosmic dust, capturing 300-megapixel images via a detector array. These detectors, each roughly the size of a saltine cracker, contain approximately 16.8 million pixels each. Eighteen of these detectors are integrated into the focal plane array, with six additional units held as flight-qualified spares. This setup allows the Wide Field Instrument and the Coronagraph Instrument to operate simultaneously, with the latter designed to block stellar glare to help image planets orbiting distant stars.
Following the successful integration of the telescope's inner and outer segments in late 2024, the mission is moving into intensive testing. After these checks, the observatory will be transported to the Kennedy Space Center in Florida during the summer of 2026. While the official launch window is slated for no later than May 2027, the team is currently on track for a potential launch as early as fall 2026 via a SpaceX Falcon Heavy rocket, sending the observatory one million miles from Earth.
Source: NASA's Roman Space Telescope: Systems, Assemble!
