November 6, 2019 updates Posted on November 6, 2019June 28, 2020 by Doug Loss Electric Sail Propulsion for Deep Space Missions https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20190032324.pdf Life on Venus and the interplanetary transfer of biota from Earth https://link.springer.com/article/10.1007/s10509-019-3678-x 2I/Borisov: A C2-depleted interstellar comet https://www.aanda.org/articles/aa/full_html/2019/11/aa36959-19/aa36959-19.html Identifiable Acetylene Features Predicted for Young Earth-like Exoplanets with Reducing Atmospheres undergoing Heavy Bombardment https://arxiv.org/abs/1911.01643 Wind erosion on Mars and other small terrestrial planets https://arxiv.org/abs/1911.01692