An Etymological Dictionary of Astronomy and Astrophysics

A technique for blocking the light of a bright source in order to reveal a faint source near it. This technique uses destructive → interference
between two or more → coherent beams from a number of telescopes to make the bright center dark. Nulling interferometry can be used to search the region immediately around a star for → extrasolar planets and
→ circumstellar dust clouds by suppressing the star’s glare.

See also: Nulling, from → null; → interferometry.