The future where human spaceflight to other worlds is common, and not relegated to a few specific optimal times because it is so costly?
Basically, the future where the distance is a calculation on the cost of the trip like prevailing wind direction and speed is for airlines. We may never get there, but it's a nice thought.
Basically, the future where the distance is a calculation on the cost of the trip like prevailing wind direction and speed is for airlines. We may never get there, but it's a nice thought.