We will have the 18th online colloquium “Extreme Universe Colloquium” on July 24th (Mon) 10:00 (JST). The speaker is Prof. Synge Todo (University of Tokyo). For details, please refer to the poster. If you have not registered yet, please register at our online event website at least three days prior to the colloquium. (It is not necessary to register again if you have done it already.)