There's also habitable worlds that are super large with higher gravity that it could make it very difficult to leave the planet and yet they could support our form of life.
If your ancestors chose to land there because they were tired of the incredibly long voyage then they would know space travel is possible but that leaving the planet is very difficult due to the extraordinary multiplier on the fuel needed to reach escape velocity.
If your ancestors chose to land there because they were tired of the incredibly long voyage then they would know space travel is possible but that leaving the planet is very difficult due to the extraordinary multiplier on the fuel needed to reach escape velocity.