| 单词 | white dwarf |
| 释义 | white dwarf A compact stellar object that is supported against collapse under self-gravity by the degeneracy pressure of electrons. White dwarfs are formed as the end products of the evolution of stars of relatively low mass (about that of the sun); high-mass stars may end up as neutron stars or black holes (see stellar evolution). White dwarfs consist of helium nuclei (and carbon and oxygen nuclei in the more massive cases) and a degenerate gas of electrons. A typical white-dwarf density is 109 kg m-3 ; white dwarf masses and radii are in the region of 0.7 solar masses and 103 km respectively. There is a maximum mass for white dwarfs, above which they are unstable to gravitational collapse — this is known as the Chandrasekhar limit and is about 1.4 solar masses |
| 随便看 |
|
物理辞典收录了3346条物理词条，基本涵盖了常用物理知识及物理英语单词词组的翻译及用法，是物理学习的有利工具。