April 21, 2021 updates Posted on April 21, 2021 by Doug Loss Discovery of an Extremely Short Duration Flare from Proxima Centauri Using Millimeter through Far-ultraviolet Observations https://iopscience.iop.org/article/10.3847/2041-8213/abf14c Interstellar communication network. III. Locating deep space nodes https://arxiv.org/abs/2104.09564 Inferring Exoplanet Disequilibria with Multivariate Information in Atmospheric Reaction Networks https://arxiv.org/abs/2104.09776 How to identify exoplanet surfaces using atmospheric trace species in hydrogen-dominated atmospheres https://arxiv.org/abs/2104.09843 Precision Millimeter Astrometry of the α Centauri AB System https://arxiv.org/abs/2104.10086