卷发
发表于 2025-3-26 21:56:53
The Sun, Our Nearest Star,In this chapter, we shall look at the Sun, bearing in mind it is a star on the main sequence. With this approach, it is possible to use the Sun as a benchmark with which to compare stars of differing size.
Phenothiazines
发表于 2025-3-27 04:28:31
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事物的方面
发表于 2025-3-27 08:08:18
Life on the Main Sequence,We have so far covered topics that describe how a star forms, how the mass of stars can be determined by observing binary-star systems, and how long it takes to become a star. Now we shall discuss how long a star will remain on the main sequence and then look at what happens due to changes in its internal structure.
充足
发表于 2025-3-27 12:21:26
Star Death: Supernovae, & Neutron Stars,We now turn our attention to high-mass stars. As you have probably surmised by now, the death throes of these stars are very different, and spectacular, compared with those of low-mass stars.
对待
发表于 2025-3-27 15:12:59
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许可
发表于 2025-3-27 19:03:05
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Budget
发表于 2025-3-28 00:52:58
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执拗
发表于 2025-3-28 03:05:29
Galaxies,Our galactic home is the Milky Way, but even though galaxies are faint ephemeral objects for must of us, they exist in many shapes, sizes and in numbers. Very big numbers - even an infinite amount of them
AWL
发表于 2025-3-28 07:18:19
Active Galaxies,We now discuss a type of galaxy that has become very prominent in astrophysical research over the past 20 or so years—. and ., or ..
Awning
发表于 2025-3-28 14:04:53
The Speculative Universe,The final chapter deals with topics that are, at present, still highly hypothetical. As well as controversial. There is not enough observational or theoretical evidence to say with any certainty that these ideas are established, but rather, are hypotheses that may in the future be shown to be correct.