A. black B. white C. long D. short 相关知识点: 试题来源: 解析 C。本题考查对胡子的描述词汇和矮人的形象特点。选项 A“black”黑色的胡子,选项 B“white”白色的胡子,这两个选项主要是颜色,而对于矮人来说,胡子的长度更能突出其特点。选项 D“short”短的胡子不符合矮人的常见形象,选项 C“l...
百度试题 结果1 题目The dwarf has a ___ beard. A. black B. grey C. white D. yellow 相关知识点: 试题来源: 解析 B。矮人通常被描绘为有灰色的胡子,选项 A 黑色、选项 C 白色、选项 D 黄色不太符合矮人的常见外貌特点。反馈 收藏
A white dwarf, despite continuing to shine, is a dead star. It is primarily composed of carbon and oxygen, having depleted its hydrogen supply and expelled most of its other elements with its outer layers.Answer and Explanation: A white dwarf star emits white light and appears white when ...
12), a white dwarf that shows similar but much more subtle variations. This class of white dwarfs could help shed light on the physical mechanisms behind the spectral evolution of white dwarfs. This is a preview of subscription content, access via your institution Access options Access Nature ...
A large equivalent width of an iron Kα emission line prefers an optically thin thermal plasma emission model to a nonthermal power-law model for the hard component, which favors a white dwarf as the accreting object, since optically thin thermal hard X-ray emission is a common characteristic ...
结果1 题目 The collapse of a star may produce a White Dwarf or a neutron star—a star,___matter is so dense___it continually shrinks by the force of its own gravity. 相关知识点: 试题来源: 解析 whose that 反馈 收藏
White Dwarf+M Dwarf Systems: A New Infrared Search 来自 Semantic Scholar 喜欢 0 阅读量: 31 作者: AG Gemmo 摘要: The knowledge of the fraction of white dwarfs (WDs) with an M star companion is of fundamental importance in various fields of astrophysics, such as cosmology and the theory...
Several mechanisms compete with gravitational settling to change a white dwarf's surface composition as it cools3, and the fraction of white dwarfs with helium atmospheres is known to increase by a factor of about 2.5 below a temperature of about 30,000 kelvin48; therefore, some white dwarfs ...
A. White dwarf. B. Red giant. C. Black hole. D. Pulsar. 相关知识点: 试题来源: 解析 C。解析:“One of the most fascinating is the black hole at the center of the galaxy.”,银河系中最迷人的天体之一是黑洞。反馈 收藏
A selection of hot subluminous stars in the GALEX survey - I. Correlation with the Guide Star Catalog\\u2605 We assembled a catalogue of bright, hot subdwarf and white dwarf stars extracted from a joint ultraviolet, optical and infrared source list. The selection ......