目前关于宇宙起源的主流学说是大爆炸宇宙论——可观测宇宙在一次大爆炸事件中诞生，至今经历了长达130多亿年的演化，期间形成了各种形式的天体和天体系统。因得到若干重要观测事实的支持，基于灾变式事件的大爆炸理论已获得学界的普遍认可。

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.