What contributions will it make to exoplanet research?

The Roman Space Telescope will employ the technique of microlensing to detect exoplanets. This method takes advantage of the gravitational lensing effect, where a foreground star acts as a lens to magnify the light from a background star. If a planet orbits the foreground star, it will create a distinct signature in the light curve. This will allow the telescope to discover exoplanets that are difficult to detect with other methods.