Glossary term: 北斗七星
Description: 北斗七星是一个著名的星宿(更准确的术语是星群),它是位于北天大熊座的一部分。北斗七星实际上是由八颗星组成:天枢(Dubhe)、天璇(Merak)、天玑(Phecda)、天权(Megrez)、玉衡(Alioth)、开阳(Mizar/Alcor)和摇光(Alkaid)。其中,开阳和辅星(Alcor)是一对双星。北斗七星的斗口两颗星(天枢和天璇)可以用来指引北极星(Polaris)的位置。由于这八颗星的亮度相近,北斗七星在夜空中特别显眼(尽管天权和辅星的亮度稍微比其他星弱一些),因此在许多文化中都有不同的名称。北斗七星的中间五颗星属于一个正在太空中共同运动的恒星群,即大熊座星宿。其中,天枢呈现红色,其他七颗星则为白色。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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