April 27, 2020 updates Posted on April 28, 2020June 28, 2020 by Doug Loss Radiation Effects on Astronautic Fertility in Space: Deep Space Policyhttps://www.sciencepolicyjournal.org/article_1038126_jspg_16_01_01.html Pulsar Positioning System: A quest for evidence of extraterrestrial engineeringhttps://www.academia.edu/31878996/Pulsar_Positioning_System_A_quest_for_evidence_of_extraterrestrial_engineering Are we going to Alpha Centauri?https://scivpro.com/manuscript/10_32386_scivpro_000019/ E|A|S (Evolving Asteroid Starships)https://link.springer.com/chapter/10.1007%2F978-3-030-33471-0_67 Tidal evolution of exoplanetary systems hosting Potentially Habitable Exoplanets. The cases of LHS-1140 b-c and K2-18 b-chttps://academic.oup.com/mnras/advance-article-abstract/doi/10.1093/mnras/staa1110/5825369 The Extended Kardashev Scalehttps://iopscience.iop.org/article/10.3847/1538-3881/ab792b Astrophysical Insights into Radial Velocity Jitter from an Analysis of 600 Planet-search Starshttps://iopscience.iop.org/article/10.3847/1538-3881/ab855a Light-induced propulsion of graphene-on-grid sails in microgravityhttps://www.sciencedirect.com/science/article/abs/pii/S0094576520301582 Radiation conditions in relativistic interstellar flighthttps://arxiv.org/abs/2004.10079 The multi-planet system TOI-421 — A warm Neptune and a super puffy mini-Neptune transiting a G9 V star in a visual binaryhttps://arxiv.org/abs/2004.10095