We will have the 25th online colloquium “Extreme Universe Colloquium” on May 13th (Mon) 10:00 (JST). The speaker is Prof.Robert Wald (University of Chicago). 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.)