确定方向
发表于 2025-3-25 03:51:49
Introduction,clear reactions within them. The nearest star to us is the Sun, and therefore the luminosities, radii, and masses of other stars are commonly expressed in Solar units. Some stars are supergiants tens of thousands of times more brilliant than the Sun; others are feeble dwarfs with just a fraction of
无法取消
发表于 2025-3-25 11:05:18
Open Clusters, star clusters can be identified with the unaided eye, a half dozen of which can even be resolved by the eye. These naked-eye clusters include the Ursa Major Group, the Hyades, Coma Berenices, the Pleiades, the Alpha Persei Group, and IC 2602 in the far southern heavens.
Excitotoxin
发表于 2025-3-25 12:02:53
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芦笋
发表于 2025-3-25 19:04:58
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纠缠,缠绕
发表于 2025-3-25 22:49:53
Stars, Globulars, Planetaries,nstruments. Most double stars have separations measured in seconds of arc, or even in tenths of a second of arc, and are much too close to be resolved in wide-field, low-power instruments. The theoretical resolving power of binoculars with 100 mm diameter objectives is less than 1.5 second of arc; b
支形吊灯
发表于 2025-3-26 04:13:38
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Free-Radical
发表于 2025-3-26 06:37:08
Introduction,t directly related: some cool stars — . like Antares and Betelgeuse — are tens of thousands times more luminous than the Sun simply because they are so large; and some hot stars — . — are hundreds of times fainter than the Sun because they are so small.
WATER
发表于 2025-3-26 11:43:05
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轻信
发表于 2025-3-26 12:57:27
Craig Crossen,Gerald RhemannGuide to areas particularly rich in objects.Guide to especially interesting objects (nebulae, clusters, galaxies).Spectacular photographs
蚀刻
发表于 2025-3-26 18:27:30
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