Lightspeed-limited message (eg radio, laser): take a collective breath, agree on a response from the UN GA, then coordinate a broadcast from all possible transm

Lightspeed-limited message (eg radio, laser): take a collective breath, agree on a response from the UN GA, then coordinate a broadcast from all possible transmitters globally. We want to show pro-social behavor and also strength in unity (even though they've seen our last hundred years via radio). Also immediately prioritize colonizing nearby systems to reduce our likelihood of extinction. Relativistic spacecraft entering our solar system: similar to above but we won't have as much time for a response so it's better if it's planned ahead of time. Also they're certain to listen to popular reactions—maybe that's something to just acknowledge in the official message, rather than trying to make Earth go dark. Discretely inform any extra-solar colonies. FTL message: devote all resources to reverse- engineering the technology, and send as many colony ships away as fast as possible (ideally with that FTL tech). Respond as per below. FTL spaceship: accept our dramatically inferior position and accept their every demand—including religious conversion and slavery—so they don't annihilate us. Getting that FTL tech is a close second priority. If they begin destroying us, broadcast a wide-spectrum warning to other colonies or species.