出典:Wiktionary
出典:『Wiktionary』 (2024/10/24 04:09 UTC 版)
coronagraph (plural coronagraphs)
出典:Wikipedia
出典:『Wikipedia』 (2011/04/15 18:21 UTC 版)
A coronagraph is a telescopic attachment designed to block out the direct light from a star so that nearby objects – which otherwise would be hidden in the star'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 around nearby stars.