I would wager minerals mining and tourism are probably the only meaningful revenue sources in our lifetimes.
Tourism to Mars and back (this is the easiest interplanetary travel) means years confined in a space rocket just to circle around Mars and get back (it is not possible to land on Mars and get back). Not that appealing…
Going to orbit is actually useful already, cf starlink
alt Hacker News
Tourism to Mars and back (this is the easiest interplanetary travel) means years confined in a space rocket just to circle around Mars and get back (it is not possible to land on Mars and get back). Not that appealing…