Nancy Grace Roman Space Telescope

The Nancy Grace Roman Space Telescope (shortened as the Roman Space Telescope, Roman, NGRST, or RST) is a NASA infrared space telescope whose construction was completed on 25 November 2025, and is scheduled to be launched to a Sun–Earth L2 orbit on 30 August 2026. It is named after former NASA chief of astronomy Nancy Grace Roman. The Roman Space Telescope is based on an existing 2.4 m (7.9 ft) wide field of view primary mirror donated by the National Reconnaissance Office and will carry two scientific instruments. The Wide-Field Instrument (WFI) is a 300.8-megapixel multi-band visible and near-infrared camera, providing a sharpness of images comparable to that achieved by the Hubble Space Telescope over a 0.28 square degree field of view, 100 times larger than imaging cameras on the Hubble. The Coronagraph Instrument (CGI) is a high-contrast, small field of view camera and spectrometer covering visible and near-infrared wavelengths using novel starlight-suppression technology. Stated objectives include a search for extra-solar planets using gravitational microlensing, along with probing the chronology of the universe and growth of cosmic structure, with the end goal of measuring the effects of dark energy, the consistency of general relativity, and the curvature of spacetime. Roman was recommended in 2010 by the United States National Research Council Decadal Survey committee

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