October 14, 2019 updates Posted on October 14, 2019June 28, 2020 by Doug Loss Helical Engine https://ntrs.nasa.gov/search.jsp?R=20190029657 Characterization of a Non-Stationary Spherical Inflated Light Sail for Ultra-Fast Interstellar Travel by Using Commercial 3D Codes https://www.researchgate.net/publication/328028194_Characterization_of_a_Non-Stationary_Spherical_Inflated_Light_Sail_for_Ultra-Fast_Interstellar_Travel_by_Using_Commercial_3D_Codes The Problem of Identifying Possible Signals of Extra-Terrestrial Civilizations in the Framework of the Information-Based Method https://www.scirp.org/html/1-1721672_95549.htm Solar sailing technology challenges https://www.sciencedirect.com/science/article/abs/pii/S1270963818314391 Phosphine as a Biosignature Gas in Exoplanet Atmospheres https://arxiv.org/abs/1910.05224