爱词霸英语   汉语   手机版   软件版下载 | English
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2.In the case of an open Universe, the mass density (denoted by the greek letter Omega) is less than unity, and the Universe is predicted to expand forever.
在一开放的宇宙里，质量密度(以希腊字母欧米加表示)是小于平均数，且宇宙被预言永远地膨胀下去。收藏指正
3.In particular, the rest-mass of neutrinos would have important influence on those cosmic problems related with mass density, such as the problems of whether the universe being open or not, the gravitational clustering in the universe, and so on.
特别是,对于那些与质量密度有关的宇宙学问题,例如宇宙的封闭或开放、宇宙中的引力成团过程等等,中微子的静质量有明显的作用。收藏指正
4.Topics include: planets, planet formation; stars, the Sun, "normal" stars, star formation; stellar evolution, supernovae, compact objects (white dwarfs, neutron stars, and black holes), plusars, binary X-ray sources; star clusters, globular and open clusters; interstellar medium, gas, dust, magnetic fields, cosmic rays; distance ladder; galaxies, normal and active galaxies, jets; gravitational lensing; large scaling structure; Newtonian cosmology, dynamical expansion and thermal history of the Universe; cosmic microwave background radiation; big-bang nucleosynthesis.
课程的主题包含了：行星、行星形成；恒星、太阳、正常的恒星、恒星形成；恒星演化、超新星、致密天体(白矮星、中子星及黑洞)、波霎、双X-射线源；星团、球状及疏散星团；星际介质、气体、尘埃、磁场、宇宙射线；距离阶梯；星系、正常及活跃星系、喷流；重力透镜；大尺度结构；牛顿宇宙学、宇宙的动力膨胀及温度发展历史；宇宙背景微波辐射；大霹雳核合成。收藏指正
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