StudyDaily
The Sun and the stars
The Sun's structure, its activity cycle and the nuclear fusion that powers it, then stellar spectra and classification, masses and sizes, and how distances to the stars are measured.
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正面 active region背面 an area on the Sun where magnetic fields are concentrated; sunspots, prominences, flares, and CMEs all tend to occur in active regions
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正面 apparent brightness背面 a measure of the amount of light received by Earth from a star or other object—that is, how bright an object appears in the sky, as contrasted with its luminosity
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正面 aurora背面 light radiated by atoms and ions in the ionosphere excited by charged particles from the Sun, mostly seen in the magnetic polar regions
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正面 binary stars背面 two stars that revolve about each other
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正面 brown dwarf背面 an object intermediate in size between a planet and a star; the approximate mass range is from about 1/100 of the mass of the Sun up to the lower mass limit for self-sustaining nuclear reactions, which is about 0.075 the mass of the Sun; brown dwarfs are capable of deuterium fusion, but not hydrogen fusion
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Creative Commons Attribution 4.0 International
CC-BY-4.0 - 署名
- Source : https://openstax.org/books/astronomy/pages/preface — Licence : Creative Commons Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/)
- 来源
- OpenStax — Astronomy (first edition)
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- English
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- 3
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