Glossary term: 月球
Description: 月球是自身并不发光的天体,但它会反射落在其上的太阳光。这就产生了月球特有的月相。月球是地球唯一的主要天然卫星,其大小和质量在太阳系内的所有天然卫星中排名第五。在英文中,首字母大写的“Moon”表示月球,而首字母小写的“moon”则表示太阳系内外的其他天然卫星。与太阳系内的其他卫星相比,月球的体积相对于它所环绕行星的体积的占比是最大的。月球沿围绕地球的椭圆轨道运行,与地球的平均距离为38.4万千米。月球没有大气层,物质组分与地球类似,内核富含铁,外层为岩石。这种相似并非偶然:据我们所知,大约45亿年前,地球和一颗火星大小的行星碰撞,产生的碎片最终形成了月球,它的大部分物质来自最初的地球地幔。月球表面既有被称为“月海”的深色区域,也有浅色高地,并布满了陨击坑。月球表面积为3.79×107平方千米,体积为2.20×1010立方千米,质量为7.35×1022千克。月球围绕地球运行的轨道周期的确切数值取决于参考系:相对于遥远的恒星,月球每27.3天运行一圈(“恒星月”)。对于地球上的观测者来说,两个新月之间的间隔时间为29.5天(“朔望月”)。
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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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Credit: Sheila Wiwchar/IAU OAE
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Credit: 丹尼尔·亨利/国际天文学联合会教育办公室
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Credit: Alessandra Masi/IAU OAE
License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
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License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
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Credit: Likai Lin/IAU OAU
License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
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Credit: Joslynn Appel/IAU OAE (CC BY 4.0)
License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
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Credit: Joslynn Appel/IAU OAE (CC BY 4.0)
License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
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Credit: Kouji Ohnishi/IAU OAE
License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
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