万灵丹
发表于 2025-3-30 08:59:59
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繁荣地区
发表于 2025-3-30 14:56:01
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颠簸地移动
发表于 2025-3-30 18:32:27
Type IIb Supernovaea few tenths of a solar mass of their original hydrogen envelopes. Their spectral evolution reveals significant Balmer lines soon after explosion that fade and become supplanted by strong lines of helium, giving evidence that the photosphere has retreated through the hydrogen envelope and into the h
教育学
发表于 2025-3-30 20:45:57
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鸟笼
发表于 2025-3-31 01:14:59
Type Ic Supernovae or helium in their ejecta. Nebular spectra have features that are typical of core-collapse supernovae. SN Ic are of typical peak luminosity. The light-curve shapes of SN Ic are somewhat heterogeneous, being rather similar near peak but showing a range of late-time decline rates. Some, but not all,
社团
发表于 2025-3-31 09:02:38
Type IIL Supernovaes. To add to the ambivalence, many SN IIL have narrow emission lines that are similar to those that are the hallmark of Type IIn (SN IIn; Chapter “Type IIn Supernovae”). Rather than constituting a distinct class, SN IIL may represent a transition from SN IIP to SN IIn depending on the extent and/or timing of presupernova progenitor mass loss.
anesthesia
发表于 2025-3-31 11:41:12
Book 2017avid Branch and J. Craig Wheeler offer a modern account of the nature, causes and consequences of supernovae, as well as of issues that remain to be resolved..Owing especially to (1) the appearance of supernova 1987A in the nearby Large Magellanic Cloud, (2) the spectacularly successful use of super
失败主义者
发表于 2025-3-31 13:44:27
n particular these motions take place in a fluid that is compressible, stratified and rotating on a spherical surface. Thus any general theory is necessarily complex and any simplifying concepts lost in the overwhelming mass of mathematical details. It therefore behooves us to make rational assumpti
Mendacious
发表于 2025-3-31 19:43:53
n particular these motions take place in a fluid that is compressible, stratified and rotating on a spherical surface. Thus any general theory is necessarily complex and any simplifying concepts lost in the overwhelming mass of mathematical details. It therefore behooves us to make rational assumpti
袋鼠
发表于 2025-4-1 01:18:20
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