I also recall seeing something that explained that even if we could get something that would take us up to 0.5c; disregarding the time distortion it would take a great distance to bring us up to that speed, and to bring us back down to make the G-force tolerable by humans.
I wonder if 500 years from now people will look at our ideas from the 20/21st century and compare us to Davinci; ie so far ahead of our time by with such great ideas, or more how we think of the people who tried to build flying machines in the 19th century.
It would also really suck if say 50 years from now we launched some sublight multi generational ship designed to get to this new planet in 200 years, and then 180 years later somebody on Earth develops warp drive and ends up passing the ship launched so much earlier.
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