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Interstellar matter, star birth and star death
The gas and dust between the stars, how stars form and how exoplanets were found, the main sequence and what follows it, then white dwarfs, supernovae, neutron stars and pulsars.
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正面 association背面 a loose group of young stars whose spectral types, motions, and positions in the sky indicate a common origin
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正面 baryon cycle背面 the cycling of mass in and out of the interstellar medium, including accretion of gas from intergalactic space, loss of gas back into intergalactic space, and conversion of interstellar gas into stars
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正面 Chandrasekhar limit背面 the upper limit to the mass of a white dwarf (equals 1.4 times the mass of the Sun)
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正面 cosmic rays背面 atomic nuclei (mostly protons) and electrons that are observed to strike Earth’s atmosphere with exceedingly high energies.
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正面 degenerate gas背面 a gas that resists further compression because no two electrons can be in the same place at the same time doing the same thing (Pauli exclusion principle)
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Creative Commons Attribution 4.0 International
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- 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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