This week in SF history— June 29, 1961, Thor-Ablestar upper stage exploded, the first unintended space debris event in history (spacesafetymagazine.com) (books.google.com)Spaceflight news— NASA releases BAA for Gateway’s Power and Propulsion Element. (parabolicarc.com)Short & Sweet— The last Falcon 9 Block 4 prepares for flight (nasaspaceflight.com)— Business Time will have to wait (twitter.com/rocketlab)Upcoming spaceflight events— Jeff Hoffman’s talk — Event page (tudelft.nl) — Streaming page (collegerama.tudelft.nl)