A coronagraph is a
telescopic attachment designed specifically to block out the harsh, direct light from a
star, so that nearby objects can be resolved without burning out the telescope's optics. 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 around nearby stars.
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