We will have the 11th online colloquium “Extreme Universe Colloquium” on December 16th (Fri) 10:00 (JST). The speaker is Prof. Seok Kim (Seoul National University). 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.)