打火石
发表于 2025-3-23 12:47:10
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Mystic
发表于 2025-3-23 15:10:12
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Mhc-Molecule
发表于 2025-3-23 20:34:11
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轻信
发表于 2025-3-24 02:13:52
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pineal-gland
发表于 2025-3-24 02:52:33
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紧张过度
发表于 2025-3-24 06:49:03
Advanced Work,ill probably soon be ready to try out more advanced observations. Some of these may be carried out using your eyes alone, while others will involve making some sort of objective permanent record, such as taking a photographic or electronic image, or producing a data set of brightness changes against
Blood-Vessels
发表于 2025-3-24 11:03:34
Book 1998 And what is the effect of observing from a site near a city? The answers are all here, with many photographs that will illustrate exactly what can be seen with different instruments (everything from the naked eye to a 300mm telescope) - and from different locations.
使显得不重要
发表于 2025-3-24 16:56:04
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lethargy
发表于 2025-3-24 20:38:46
Galaxies,9.1) like that of stars, and so must be aggregations of very distant stars. The first of these groups we now know as the nebulae (see Chapter 8), and it includes things like H II regions, Planetary Nebulae, Supernova Remnants etc.
Parameter
发表于 2025-3-25 02:02:01
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