We will have the 17th online colloquium “Extreme Universe Colloquium” on June 6th (Tue) 19:00 (JST). The speaker is Prof. Harvey Reall (University of Cambridge). 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.)