June 15, 2021 updates Posted on June 15, 2021 by Doug Loss Tractor beams, pressor beams, and stressor beams in general relativity https://arxiv.org/abs/2106.05002 The Dynamics of the Transition from Kardashev Type II to Type III Galaxies Favor Technosignature Searches in the Central Regions of Galaxies https://iopscience.iop.org/article/10.3847/2515-5172/ac0910 KMT-2019-BLG-2073: Fourth Free-floating Planet Candidate with θE < 10 μas https://iopscience.iop.org/article/10.3847/1538-3881/abfc4a A Tidal Origin for a Three-body Resonance in Kepler-221 https://iopscience.iop.org/article/10.3847/1538-3881/abfb78 Incorporating Inner Magnetosphere Current-driven Electron Acceleration in Numerical Simulations of Exoplanet Radio Emission https://iopscience.iop.org/article/10.3847/1538-4357/abefd9 Planetary Systems Around White Dwarfs https://arxiv.org/abs/2106.06550 Strategies for Maximizing Detection Rate in Radio SETI https://arxiv.org/abs/2106.06594 Systematic KMTNet Planetary Anomaly Search, Paper II: Five New q<2×10−4 Mass-ratio Planets https://arxiv.org/abs/2106.06686 The architecture of multi-planet systems as a tracer of their formation mechanisms https://arxiv.org/abs/2106.07058 CHEOPS Precision Phase Curve of the Super-Earth 55 Cnc e https://arxiv.org/abs/2106.07443 Gravitational lensing by an extended mass distribution https://arxiv.org/abs/2106.06696 Nebula-Relay Hypothesis: Primitive Life in Nebula and Origin of Life on Earth https://arxiv.org/abs/1910.06396