Well, if we really wanted to we could probably hack something together along the lines of the Project Orion designs right now, but it would be hugely expensive and pretty messy so I can't see anyone doing that.
http://en.wikipedia.org/wiki/Project_Orion_%28nuclear_propul...
I suspect if we do send out interstellar probes they will be tiny rather than flying battleships:
Re:NASA Hubble Finds a True Blue Planet
by maxerickson on Friday July 12, 2013 @09:28AM
(#6032435)
The hominid diaspora occurred using feet and canoes. Tens of thousands of years ago.
Of course no individuals 'traveled the globe' in that era, but a gradual process was plenty sufficient to cover the globe with humans.
Its too early to think of traveling to far points in space using the technology we have.
Imagine some thousands of years back, planning to explore the world using an ox cart. Yet today, airplanes have made that perfectly possible.