Mary and Tony
"Honestly?" Tony shrugged his shoulder again, then lowered his voice a bit, "I don't really think anyone's trying to figure it out. Maybe they don't have the man power, or maybe they just don't want to. It could even be a one-way kind of deal and they're scared to tell us. But wormholes are a great answer to the question. They open up doorways from one plane of existence to the other, and let people travel through. You're pretty damn smart, Princess."
After a pause he added, "I wonder if there's a science they've got here yet that opens them up on purpose. I don't think the people on this ship are the ones pulling the strings there. It's got to be someone else."