December 11, 2019 updates Posted on December 11, 2019June 28, 2020 by Doug Loss Searching for a standard Drake equation https://arxiv.org/abs/1912.01783 Planetary Astrobiology https://uapress.arizona.edu/book/planetary-astrobiology The Helical Engine http://people.uncw.edu/ganl/phy335/project/group-A/Calton-Landon.pdf The Young Suns Exoplanet Survey: Detection of a wide orbit planetary mass companion to a solar-type Sco-Cen member https://arxiv.org/abs/1912.04284 Upper Limits on Planet Occurrence around Ultracool Dwarfs with K2 https://arxiv.org/abs/1912.04286 Constraining Orbital Periods from Nonconsecutive Observations: Period Estimates for Long-Period Planets in Six Systems Observed by K2 During Multiple Campaigns https://arxiv.org/abs/1912.04287 Constraints on Aquatic Photosynthesis for Terrestrial Planets Around Other Stars https://arxiv.org/abs/1912.04301 The Influence of Stellar Contamination on the Interpretation of Near Infrared Transmission Spectra of Sub-Neptune Worlds around M-Dwarfs https://arxiv.org/abs/1912.04389