June 21, 2021 updates Posted on June 21, 2021 by Doug Loss Drake-like Calculations for the Frequency of Life in the Universe https://www.mdpi.com/2409-9287/6/2/49/htm Worldship and self replicating systems https://i4is.org/wp-content/uploads/2021/06/Worldship-and-self-replicating-systems-Principium32-print-2102221659-opt.pdf Space ML http://www.spaceml.org/ Radio interference reduction in interstellar communications: methods and observations https://arxiv.org/abs/2106.10168 The Occurrence-weighted Median Planets Discovered by Transit Surveys Orbiting Solar-type Stars and Their Implications for Planet Formation and Evolution https://arxiv.org/abs/2106.09725 Polarimetric Signature of Ocean as Detected by Near-Infrared Earthshine Observations https://arxiv.org/abs/2106.10099 An analytical model for tidal evolution in co-orbital systems I. Application to exoplanets https://arxiv.org/abs/2106.10186