File:Titan transits Crab Nebula 2003.jpg
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English: Very rarely, Saturn transits the Crab Nebula. Its transit in 2003 was the first since 1296; another will not occur until 2267. Observers used the Chandra X-ray Observatory to observe Saturn's moon Titan as it crossed the nebula, and found that Titan's X-ray 'shadow' was larger than its solid surface, due to absorption of X-rays in its atmosphere. These observations showed that the thickness of Titan's atmosphere is 880 km (550 mi). The transit of Saturn itself could not be observed, because Chandra was passing through the Van Allen belts at the time.
中文（简体）：土星凌蟹状星云是很罕见的，最近一次是2003年，而更前的一次在1296年，下次则要到2267年。天文学家运用钱德拉X射线天文台在土星凌星云时观测它的卫星土卫六，并发现土卫六的X射线暗斑比它的固体表面更大，因为它的大气层也能吸收X射线。这些观测表明土卫六的大气层厚度大约是880千米。土星的凌星没有被观测到，因为钱德拉X射线天文台当时正在经过范艾伦辐射带。 |
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| Source | http://chandra.harvard.edu/photo/2004/titan/ | |||||
| Author | NASA/CXC/Penn State/K.Mori et al. | |||||
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:52, 23 January 2012 | | 756 × 576 (218 KB) | Makecat | {{Information |Description ={{en|1=ery rarely, Saturn transits the Crab Nebula. Its transit in 2003 was the first since 1296; another will not occur until 2267. Observers used the Chandra X-ray Observatory to observe Saturn's moon Titan as it crossed t |
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