Pencil December 18th (tentatively) into your calendar. That's when James Webb probably launches

You may have heard this one before, but encouraging news comes from NASA, ESA, and Arianespace today: they are now targeting December 18, 2021 as the new launch date for the oft-delayed James Webb Space Telescope (JWST). The latest linchpin in getting JWST off the ground is that the Ariane 5 rocket appears to be …