For the past month, we had begun to receive radio signals broadcasting audio in the German language reminiscent of propaganda from 1940s earth.
For the past month, we had begun to receive radio signals broadcasting audio in the German language reminiscent of propaganda from 1940s earth.
I also had to think about this, but another scenario would be that 20 years after the voyage left Earth, the Nazis took over the planet and immediately started broadcasting propaganda. Those transmissions would take 30 years to travel 30 light years, which puts the reception timeline at 50 years since departing Earth.
For anyone intrigued by this sort of sci-fi timeline, I would recommend Liu Cixin’s Remembrance of Earth’s Past trilogy, also known by the title of the first book, The Three-Body Problem.
Spoiler: The third book has a scenario where
voyagers initiate an event which takes two years to be observable on Earth, and this ends up saving humanity in the short term.