Despite the fact that space vehicles rely on different technologies, they do share one thing. “The common element really, at the core, is people,” says Koller. “People are the ones that make mistakes. But people also need to feel safe enough to speak up when you see an unsafe situation or unsafe environment.” Perhaps the most important way to keep space tourists safe, Koller posits, is by creating a “safety culture,” one where engineers and technicians aren’t afraid to point out something that seems dangerous or sloppy.