How will NASA’s Roman Space Telescope see exoplanets?

To see exoplanets, NASA's Roman Space Telescope will use advanced planet-imaging technology. When searching for exoplanets, stars pose a challenge due to their brightness. However, astronomers aim to directly observe these planets despite the difficulties. The Nancy Grace Roman Space Telescope, set to launch on August 30, 2026, will revolutionize the field with its unique imaging capabilities.

Unlike Hubble, Roman's Wide Field Instrument boasts a much larger field of view, allowing it to observe astronomical targets in a single shot. The Coronagraphic Instrument (CGI) is the star of the show, designed to directly image planets orbiting nearby stars. The CGI utilizes a sophisticated coronagraph, a device that blocks out starlight, allowing the faint exoplanet to be observed.

This coronagraph incorporates multiple masks and active optics to counteract starlight fluctuations, ensuring that the light from the exoplanet reaches the detector. While the CGI can only observe stars of magnitude 5 or brighter, it will still target over 1,000 such stars, providing valuable data on alien worlds. Although Roman may not significantly increase the number of known exoplanets, its CGI will capture high-quality images and spectra of gas giants like Jupiter and Saturn, offering unprecedented insights into their atmospheres and potential for habitability.