The first discovery of an extrasolar planet around a sun-like star was 51 Pegasi B, an exoplanet roughly 50 light-years away, unofficially named Bellerophon after the tamer of the mythical Pegasus.
第一个被发现的太阳系外行星是51 Pegasi B，它围绕着一颗类日恒星旋转，距离地球约为50光年，它被非正式的命名为Bellerophon，Bellerophon是驯服了文艺女神珀加索斯的一位希腊英雄。
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