[Were there any expeditions to Mars of purely scientific nature still in progress in this day and age? Unless the boy's come from a point much further in Yamagi's past.

It's a good explanation as any.]

I was born there. Well, that's me and everyone I know, really. I'd never even left Mars until a few years ago.

[He can't believe it's been eight years already. Yamagi winds the noodles around his chopsticks listlessly before unfurling the starchy knot.]

But almost everyone on this ship seems to be from Earth, after a fashion.