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词条 Arcturus
释义
Arcturus
star
also called Alpha Boötis
one of the five brightest stars in the night sky, and the brightest star in the northern constellation Boötes, with an apparent visual magnitude of −0.05. It is an orange-coloured giant star about 37 light-years from the Earth. It lies in an almost direct line with the tail of Ursa Major (the Great Bear); hence its name, derived from the Greek words for “bear guard.”
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更新时间:2025/7/24 16:37:12