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阿波罗 11 号任务的月面活动
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图注： 美国国家航空航天局宇航员埃德温·巴兹·奥尔德林在月球上进行舱外活动（EVA）时，在阿波罗11号 "鹰 "月球着陆器前安装地震仪。尼尔·阿姆斯特朗在1969年人类首次登月任务中拍摄了这张照片。
来源： 美国国家航空航天局/阿波罗项目档案
来源链接
词汇表:
阿波罗 , 月球
分类：
太阳系
, 太空探索
授权许可： 公共领域 公共领域 图标
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8.41 MB)
帕拉纳尔日落时新月和金星相伴的景象
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图注： 在南半球智利的帕拉纳尔天文台拍摄到日落时分的新月。月面仅有一弯细长的明亮部分，这片亮面正对刚刚沉入地平线的太阳。月球左下方可见闪耀的金星。
前景中展示的是天文台使用的辅助望远镜之一，这些望远镜有时会与甚大望远镜（VLT）联网协同观测。。
来源： ESO/Y.贝列茨基
来源链接
词汇表:
月相 , 金星 , 蛾眉月 , 新月
分类：
太阳系
, 望远镜、仪器与天文台
授权许可： 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标
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2.34 MB)
Ganymede seen by Juno spacecraft
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图注： Ganymede is the largest and most massive natural moon of Jupiter, and at the same time, the largest moon in the solar system. It also stands out as it is the only moon in the solar system which has an internally generated magnetic field. This is likely created by a liquid iron or iron sulfide core.
With a diameter of over 5,000 kilometers, it exceeds Mercury in size. Although it has more than twice the mass of Earth's Moon, it hosts weaker surface gravity than Mercury, Io, and the Moon due to its lower mean density.
Ganymede's appearance is primarily composed of darker, heavily cratered regions, and brighter, less bombarded ones with deep grooves and ridges indicating geological activity. Whether this might be caused by tidal heating is still subject to further analysis. The brighter regions make up around two-thirds of Ganymede's surface.
The remaining area consists of dark regions, saturated with impact craters, which have been dated back to four billion years. It is assumed that the moon hosts a large saltwater ocean under its icy surface with extreme depths of up to 800 kilometers.
Ganymede likely has a very tenuous oxygen atmosphere, comparable to that found on the Jupiter moon Europa. It cannot be interpreted as a sign of life. Instead, it is thought that hydrogen and oxygen are split up by radiation on the moon's surface.
The first space probe to visit Ganymede was Pioneer 10, performing a high-speed flyby manoeuvre through the Jupiter system. Since then, it has been investigated by several other probes such as Galileo, New Horizons, and Juno. The Jupiter Icy Moons Explorer (JUICE) will be the first to actually enter orbit around Ganymede itself (in around 2034) to further study the moon's magnetic and icy surface. JUICE will impact Ganymede as the last act of its mission.
来源： NASA/JPL-Caltech/SwRI/MSSS/Kevin M. Gill
来源链接
词汇表:
伽利略卫星 , 卫星
授权许可： 知识共享许可协议 Attribution 2.0 Generic 知识共享许可协议 Attribution 2.0 Generic 图标
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1.85 MB)
