适婚女孩
发表于 2025-3-21 18:47:51
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谈判
发表于 2025-3-21 22:10:00
Stellar Evolution,all be concerned with the reverse process, in which stars lose mass back to the interstellar medium. We shall also be interested in late stages of evolution of stars in which they have properties especially interesting for the determination of galactic distances and we shall discuss the properties of some of the endpoints of stellar evolution.
奇怪
发表于 2025-3-22 02:54:49
Systems and Catalogues of Proper Motions,22 stars is titled . Then Bessel made many thousands of measurements of stellar positions with a transit circle at Koenigsberg. The measurements carried out by Bradley, Maskelyne, and by Bessel form pioneer work in the derivation of accurate proper motions.
磨坊
发表于 2025-3-22 08:23:45
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整顿
发表于 2025-3-22 09:59:23
The Evolution of Spiral Structure,ors in the problem: the role played by the masses of stars, and the development of a chemical inhomogeneity through the exhaustion of the nuclear fuel, hydrogen, in the central core. In galactic evolution, I fear we may be lacking some vital information or understanding that is as basic and fundamental as these were to stellar evolution.
背带
发表于 2025-3-22 16:22:20
Historical Development of Our Ideas Concerning the Structure of the Galaxy, true, had already expressed the view that the stars would be suns of the same nature as our sun, and that the glittering band of the Milky Way consisted of small particles, but these views were not generally adopted. Copernicus and Kepler spoke only of a’ sphere of fixed stars’ — . — whose diameter
夸张
发表于 2025-3-22 18:55:09
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缩短
发表于 2025-3-22 21:27:37
Photometry and Photometric Systems, instinctive, and the relevant information seems to be very easy to obtain. This apparent simplicity hides numerous pitfalls which it is not always easy to avoid. We will not discuss here the methods used for reducing the measurement to its value outside the atmosphere, this having been done very we
蛰伏
发表于 2025-3-23 02:22:06
Space Distribution and State of Motion of the Early-Type Stars, Open Clusters, Associations and Stegh-luminosity objects. Usually, fundamental far-reaching distance determinations are based on photometric and spectroscopic methods. The luminosity calibration cannot be separated, in general, from the more general problem of calibrating the spectral classifications in terms of luminosities, intrins
弹药
发表于 2025-3-23 09:33:36
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