http://nextbigfuture.com/2015/09/steps-to-interstellar-laser-pushed.html
http://nextbigfuture.com/2015/09/steps-to-interstellar-laser-pushed.html
Here's a summary: http://cdn.meme.li/instances/500x/52982953.jpg
I kind of wish we still had a cold war. Advancements in space tech would be a lot more than what we have now. Maybe even a moon base on Mars.
The article talks about using Solar Sails and a LASER instead of Sunlight as a viable Interstellar Drive.
http://www.projectrho.com/public_html/rocket/enginelist.php