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Using solar sails with a laser driven power system to launch from orbit, and traveling at 20% of the speed of light, tiny little Starships will visit Alpha Centauri. There will be a swarm of postage stamp sized nanocraft sent to our nearest neighbor to look for signs of life and give us more detailed information about the resources available there. If you are asking When will this happen?, they are working on it now, with the goal of launching within a decade or two. The folks involved in Breakthrough Starshot include Steven Hawking, Freeman Dyson, Yuri Milner, Ann Druyan, and a host of others.