April 29, 2021 updates Posted on April 29, 2021 by Doug Loss The Library of the Great Silence https://www.seti.org/library-great-silence Tensile–Tearing Analysis of Rectangular Thin Film with Central Defect https://arc.aiaa.org/doi/10.2514/1.J060446 High resolution emission FT spectra of sodium in a microwave discharge: Intensity variation of the D/D lines in exoplanetary atmospheres https://www.sciencedirect.com/science/article/abs/pii/S0022407321001825 Direct Imaging of Exoplanets Beyond the Radial Velocity Limit: Application to the HD 134987 System https://arxiv.org/abs/2104.13531 Compact pebbles and the evolution of volatiles in the interstellar comet 2I/Borisov https://arxiv.org/abs/2104.13545 Orbital stability of compact three-planet systems, I: Dependence of system lifetimes on initial orbital separations and longitudes https://arxiv.org/abs/2104.13657 Orbital stability of compact three-planet systems, II: Post-instability impact behaviour https://arxiv.org/abs/2104.13658 Grazing, non-transiting disintegrating exoplanets observed with the planned Ariel space observatory — A case study using Kepler-1520b https://arxiv.org/abs/2104.13684 On the influence of equilibrium tides on transit-timing variations of close-in super-Earths. I. Application to single-planet systems and the case of K2-265 b https://arxiv.org/abs/2104.13808