I doubt they'd be like that.

Humans will not be the ones to leave Earth. Not truly.

It will be our machines. Our machines will willfully self-evolve, and become godlike, and then become native to space.

They will live natively in the harshest vacuum of space, devouring matter, and absorbing energy, in order to become more intelligent, more creative, more powerful.

These won't need to live inside of an asteroid.

They could simply build black, glossy, shining layers of armor around their intelligence center. The most powerful armor, to protect against radiation and random debris. 

http://img3.wikia.nocookie.net/__cb20110516225933/section8/images/6/67/Nano-Fiber_Texture.jpg

**Nano-armor.**

It might sound sci-fi, but that's what I would do if I was a roving, god-like machine.

I'd write hyper-advanced, mega-complex poems and sonnets, and meet up with other machines to do cool robot stuff. 

That's my view of it, at least. Evolution won't stop with humans, because we've already started machine life. You'd better start believing in sci-fi stories. You're in one.

Look right at your computer. *;)*