李广兴，云南大学西南天文研究所副教授。分别在北京大学（2007）、中国科学技术大学（2010）和德国马普射电天文所（2014）获得学士、硕士和博士学位。随后在德国慕尼黑大学做博士后研究（2014-2018）。2018年通过海外人才引进加入云南大学西南天文研究所。主要研究领域包括星际介质、恒星形成、天体物理中的动力学过程等。The Milky Way is a complex ecosystem where the formation of stars and the circulation of interstellar gas are tightly linked. I will discuss a few projects: First, a global view of the kinematics and evolution of the local interstellar medium, where we combine the Gaia astrometry measurement with radial CO velocity measurements to determine the 3D velocity of the interstellar gas and forecast the evolution.  The full 3D kinematic measurement shed light on the nature of the gas structures seen in the Milky Way disk. Second, a new theory of massive star formation. The formation of massive stars remains a question and debate. Past theories of massive star formation are based on the Jeans, in one way or another. However, the Jeans criterion is not applicable in star-forming regions, as the assumption of stationary initial condition is violated in star-forming regions where the density structures are created in short durations. I will present the framework of a new theory where massive stars form by super-jeans fragmentation, followed by tidally-regulated accretion.