This former combat engineer didn’t think he’d live to 30. Now he’s a candidate for Mars One, and not even the prospect of leaving his loved ones behind can scare him off.

Yari and R. Daniel found each other, and fell in love, because of their shared passion for space exploration. Now they’re both finalists for Mars One—which means the rest of their life together might play out on a different planet.

This Nevada-based architect sees preparation for the colonization of Mars as an escape from the “mundanities of life,” but that doesn’t mean she thinks it will be easy. And the biggest challenges could be psychological.

Peter is determined to fulfill his lifelong dream of exploring space—even if it means the end of his marriage. But he wants to stay on earth long enough to see his kids to adulthood, before he becomes “their dad who lives and works on Mars.”