On the topic of living on Mars, one thing I saw was the concept of a “cycler”, which is a repeating orbit that intersects the orbits of two planets at regular intervals. Buzz Aldrin (yes, THE Buzz Aldrin) worked one out for Mars that could, if run in both forward and reverse directions, result in a one-way, 146-day transit between planets with a stay duration of 633 days. Might be worth exploring the feasibility if we’re planning on launching people to Mars.