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Or they would be forced to figure out technology that we would consider science-fiction, assuming it's possible. To consider our tech as the pinnacle is the wrong approach, I think.

Perhaps we've had it too easy here - moderate climate, oil as an easy fuel source, and gravity that isn't too oppressive. I wonder what technology would arise in a more difficult environment, such as this superearth.

Nuclear thermal rockets would also be an option.

Ironically I think you’d be more likely to go to space on such a planet. Imagine being barely able to jump, let alone fly. You would want to leave more than anything. It would be like a space race, against the universe.

I’m imagining some sort of mega cannon or railgun as a propulsion method to fling them off the planet.