Nulling is a technique used in astronomy and optics to cancel out the light from a bright source in order to observe fainter objects nearby. It involves creating destructive interference patterns using multiple light beams or mirrors to effectively "null out" the light from the bright source. This allows researchers to study fainter objects, such as exoplanets or dust disks, that would otherwise be obscured by the brightness of the nearby source. Nulling is an important technique in the field of high-contrast imaging and is used in a variety of telescopes and instruments to enhance the detection and study of faint astronomical objects.