Back مرسام الإكليل Arabic Coronògraf Catalan Koronograf Czech Koronagraf Danish Koronograf German Coronógrafo Spanish Koronagraaf Estonian تاجنگار Persian Koronagrafi Finnish Coronographie French
A coronagraph is a telescopic attachment designed to block out the direct light from a star or other bright object so that nearby objects – which otherwise would be hidden in the object's bright glare – can be resolved. Most coronagraphs are intended to view the corona of the Sun, but a new class of conceptually similar instruments (called stellar coronagraphs to distinguish them from solar coronagraphs) are being used to find extrasolar planets and circumstellar disks around nearby stars as well as host galaxies in quasars and other similar objects with active galactic nuclei (AGN).