Dave Brody writes and directs space-themed non-fiction documentary television.

There is much talk lately about cities on Mars, multiple bases on the moon, free orbiting "islands" in space where tens of thousands of people might live and even interstellar generation ships.

But what defines a true community — as different from a simple base or an outpost — is that a proper settlement must maintain a self-sustaining population. And that means kids in space. Providing the nurturing care they'll need will not be easy.