October 15, 2018 updates Posted on October 15, 2018June 28, 2020 by Doug Loss Fermi and Lotka: The Long Odds of Survival in a Dangerous Universe https://arxiv.org/abs/1810.03088 Photometric limits on the high resolution imaging of exoplanets using the solar gravity lens https://www.sciencedirect.com/science/article/pii/S0094576518307987 Constraining the period of the ringed secondary companion to the young star J1407 with photographic plates https://arxiv.org/abs/1810.05171 Limits on Clouds and Hazes for the TRAPPIST-1 Planets https://arxiv.org/abs/1810.05210 Evidence of magnetic star-planet interactions in the HD 189733 system from orbitally-phased Ca II K variations https://arxiv.org/abs/1810.05253 Rings and gaps in protoplanetary disks: planets or snowlines? https://arxiv.org/abs/1810.05614 Impacts of dust feedback on a dust ring induced by a planet in a protoplanetary disk https://arxiv.org/abs/1810.05635