Core Insights - The article celebrates the 100th issue of "Knock Knock World" and introduces a mini-series on space exploration, highlighting the increasing relevance of space travel in everyday life [4][10]. Space Exploration Series - The first episode discusses the Shenzhou 21 mission, which took four mice to space for experiments related to long-term survival and reproduction in space, aimed at preparing for future lunar bases and deep space missions [5][12]. - The second episode addresses the issue of space debris, emphasizing the growing concern as the number of rocket launches increases, with 290 launches recorded globally by the end of November, including SpaceX's frequent missions [13]. Audience Engagement - The series reflects the curiosity of young listeners about practical aspects of space travel, such as what astronauts do in space, their diet, and how they manage health issues [10][11]. - The article notes that the questions from young audiences indicate a shift from viewing space exploration as a distant concept to a tangible reality that requires concrete answers [11][12]. Future of Space Exploration - The article suggests that the exploration of space will continue to be a significant topic in future episodes, with a focus on the practical implications of space travel and the challenges posed by space debris [14].