"The Alpha Centauri Manifesto" --Starshot's Interstellar Search for Life in the Universe

As all the world knows by now, Yuri Milner, the Russian billionaire investor, and Stephen Hawking, the famed astrophysicist, have revealed plans for an interstellar mission, $100 million Breakthrough Starshot, that would launch chip-sized robotic probes at more than 25...