On Wed, 6 Oct 2010 11:12:08 -0600, you wrote:

>Although an exploration mission certainly is not going to happen anytime in 
>the next few decades or longer, it wouldn't require an unrealistic advance 
>in propulsion technology to get a small spacecraft that distance in a fairly 
>reasonable time- say a couple hundred years. You don't need to travel the 
>speed of light.

So nobody has to redo the math:

http://blogs.discovermagazine.com/discoblog/2010/10/04/so-how-long-would-it-take-to-travel-to-that-exciting-new-exoplanet/
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