Date: December 17, 2025 In this Issue: Canadian Gemini Office News ngVLA Update Update on CASTOR CCAT/FYST Update SKA Update CFHT News and Updates Dissertation: The Role of Gas in Star Cluster Formation Dissertation: Dynamics and Feedback of Massive Binaries Editor: Dennis Crabtree Cassiopeia is CASCA’s quarterly Newsletter, published on or near the solstices and equinoxes (March 21, June 21, September 21 and December 21). To submit a contribution please email cassiopeia.edit