"Elon Musk spoke with Joe Rogan about getting Mars colonization to the point
where it would be self-sustaining without additional supplies or support from
Earth.

The entire point for Elon is to sustain the species indefinitely.

Joe Rogan also asked Elon about aliens. Elon answered that there either many
aliens or no aliens."

See:

https://www.nextbigfuture.com/2021/0...he-galaxy.html