I think it means that some things we've been told are fundamental truths aren't.

I know it's not a joke, going out there. It's dangerous and who knows what's out there. But that's part of it too. What if we could find something? Something to help cure this disease or open up a way home? What if some part of an answer is lying out there, forgotten, because no one's bothered looking that far?

I think it's worth a shot, at least.

_{[ He shrugged. They were just his thoughts on it, but more and more he looked at the eggshell they lived in and wanted to see what was out there. Curiosity, and a true belief that remaining stagnant within the Dome wouldn't do any good for anyone. ]}