[from occupied ga]

There is a proposal that tiny chip sized craft with large solar sails could be accelerated with giant lasers and reach 20% of light speed.

To what purpose? It would have to be able to return information somehow, and any radio or laser power source necessary to get the energy to be detectable at 25 trillion miles away would be one heck of a lot larger than "chip sized"

[conejo99]

http://www.sciencemag.org/news/2016/04/russian-billionaire-unveils-big-plan-build-tiny-interstellar-spacecraft

I think there are a couple varieties of plans. Some use the light sail as a return signal device.