Nuller
（重定向自Nulling）
![The Visible Nulling Coronagraph (VNC) experimental breadboard at NASA Goddard Space Flight Center.](/Images/godic/202501/30/VNC_at_NASA_GSFC0240.jpg")
A nuller is a tool used to block out a strong source so that fainter signals near the source can be observed. An example of a nuller is being employed on the Keck Interferometer. This causes the light from a star to destructively interfere, effectively cancelling out the star's image. The faint light from an orbiting ring of dust can then be detected. This project is part of a scientific effort to detect and observe nearby planets.