An extragalactic supernebula confined by gravity

Little is known about the origins of globular clusters, which contain hundreds of thousands of stars in a volume only a few light years across. Radiation pressure and winds from luminous young stars should disperse the star-forming gas and disrupt the formation of the cluster. Globular clusters in our Galaxy cannot provide answers; they are billions of years old. Here we report the measurement of infrared hydrogen recombination lines from a young, forming super star cluster in the dwarf galaxy NGC5253. The lines arise in gas heated by a cluster of about one million stars, including 4,000-6,000 massive, hot 'O' stars. It is so young that it is still enshrouded in gas and dust, hidden from optical view. The gases within the cluster seem bound by gravity, which may explain why the windy and luminous O stars have not yet blown away those gases. Young clusters in 'starbursting' galaxies in the local and distant Universe may also be gravitationally confined and cloaked from view.     

生物科学专业实验教学创新教育模式的构建

分析高等院校现行的实验教学教育模式，发现存在有无法实现创新教育宗旨的弊端，通过加强创新教育理念的树立，明确专业创新能力培养的内涵，进行适应培养创新人才需要的课程体系改革，调整教学内容，改革教学的方法，建立能力水平考核方式等教学实施。构建生物科学专业实验教学新模式，从而充分发挥高等院校的优势，全面提高大学生的创新素质。