关键词: 大爆炸宇宙学, 宇宙膨胀, 微波背景辐射, 宇宙氦丰度

Abstract: At present the bigbang cosmology was accepted by most of astronomers to interpret the origin and evolution of the Universe, which was supported by a number of  important observational facts, such as cosmic expansion, microwave background radiation and cosmic helium abundance. The bigbang may be regarded as a cosmic catastrophic event on the largest scale, which leads to the formation of various kinds of celestial objects including stars and galaxies and their evolution during the following 13 billion years or longer.

Key words: bigbang cosmology, cosmic expansion, microwave background radiation, cosmic helium abundance