December 24, 2020 updates Posted on December 24, 2020 by Doug Loss Photonic Laser Thruster: 100 Times Scaling-Up and Propulsion Demonstration https://arc.aiaa.org/doi/abs/10.2514/1.B38144 Exotic Fluids Matching the Stress-Energy Tensor of Alcubierre Warp Drive Spacetimes https://arxiv.org/abs/2012.09941 Semi-analytical model for planetary resonances: application to planets around single and binary stars https://arxiv.org/abs/2012.12296 The Keck Planet Imager and Characterizer: Phase I fiber injection unit early performance and commissioning https://arxiv.org/abs/2012.12318