BEIJING — On 13 January 2021, GAN Weiqun (Purple Mountain Observatory, Chinese Academy of Sciences) gave an online seminar on the Advanced Space-based Solar Observatory (ASO-S) mission of the Chinese Academy of Sciences. Prof. Gan's lecture represented the eighth webinar of the ISSI-BJ "On Things to Come" series that addresses ongoing as well as future space missions by inviting renowned scientists from different countries, institutes, and space agencies.