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土卫六自然色彩图像
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图注： 这张由美国宇航局卡西尼号飞船于 2012 年 1 月拍摄的照片显示了土星卫星土卫六接近自然的颜色。橙黄色源自一层部分带电的碳氢化合物。在可见光下，土卫六的表面大部分隐藏在不透明的大气层之下。
来源： 美国宇航局/喷气推进实验室/空间科学研究所
来源链接
词汇表:
卫星 , 泰坦
分类：
太阳系
授权许可： 公共领域 公共领域 图标
文件
( 图像
24.07 kB)
具有表面特征的土卫六
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图注： 这张由美国宇航局的卡西尼号飞船于 2015 年 11 月拍摄的合成图像直观地显示了土星卫星土卫六的红外辐射。红外线可以穿透其朦胧的大气层，揭示其表面的一些特征。在前往土卫六表面的过程中，欧空局的惠更斯号着陆器发现了由液态碳氢化合物构成的湖泊。
来源： 美国宇航局 / 喷气推进实验室 / 亚利桑那大学 / 爱达荷大学
来源链接
词汇表:
卫星 , 泰坦
分类：
太阳系
授权许可： 公共领域 公共领域 图标
文件
( 图像
160.31 kB)
The Callisto satellite
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图注： Callisto is the outermost of the four large Galilean moons of Jupiter and the third largest in the whole solar system, falling behind only Ganymede and Saturn's moon Titan. It orbits Jupiter at an average distance of around 1.9 million kilometers, roughly six times the distance between Earth and the Moon.
With a diameter of nearly 5,000 kilometers, it is almost as large as Mercury, the smallest planet in our solar system, but has only a third of its mass as it is composed of approximately equal amounts of rock and ice.
Callisto orbits Jupiter in a tidally locked rotation, always showing the same side to Jupiter. In contrast to the other three Galilean satellites – Io, Europa, and Ganymede – it is not in orbital resonance due to its farther outward location and is thus not appreciably tidally heated. It does not show any signs of plate tectonics or volcanic activity. Its lack of geological processes means that surface features like craters remain unchanged for billions of years. It is thought to have evolved predominantly under the influence of impacts, as its surface is the oldest and most heavily cratered object in the solar system. In fact, it is so covered in craters that any new impact will likely erase a former one.
Callisto's internal structure is still subject to discussion; it may consist of a deep salty ocean. It is thought to be composed mainly of a mix of ice and rock, which are present in various states throughout the inner layers of the moon. Callisto hosts a very thin atmosphere composed mainly of carbon dioxide and some traces of oxygen. The moon has been studied by numerous space probes, such as the Pioneer and Voyager missions and the Galileo orbiter, and will be subject to further explorations by NASA, ESA, and China’s National Space Administration (CNSA).
来源： NASA/JPL/DLR
来源链接
词汇表:
伽利略卫星 , 卫星
授权许可： 公共领域 公共领域 图标
文件
( 图像
610.45 kB)
Moon covering the Sun
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图注： Moon covering the Sun during the total solar eclipse of April 8th, 2024. The solar corona is also visible at totality. Image taken in Arkansas, USA. This image was processed using a Larson-Sekanina-style technique. Multiple exposures ranging from 1/500 second to 4 seconds were stacked and combined with a rotational gradient filter to reveal fine structural detail across the corona's extreme brightness range. This is done because the inner corona saturates at longer exposures, while the outer corona and the Moon are only visible at those same longer exposures.
来源： Carolin Liefke
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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( 图像
15.25 MB)
