Today I tag @entirely-of-flaws.

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Until very recently, this idea remained solidly within the realm of science fiction. But today the outlook is beginning to change. In April, the physicist-turned-internet-billionaire Yuri Milner, together with Stephen Hawking and other notable scientists and engineers, announced that the Breakthrough Foundation would begin funding work on the concept of a laser-propelled starship, with the long-term goal of reaching the closest neighboring star system to our own, Alpha Centauri. Their initiative, dubbed Breakthrough Starshot, is a Silicon Valley take on Forward’s vision that imagines shrinking the spacecraft down to a mass of a few grams. A fleet of such “nanocraft”, each tethered to a light sail a few meters wide, could be economically launched into space and then accelerated toward Alpha Centauri with a terrestrial laser system. Illuminated by tens of gigawatts of laser light, the miniature spacecraft would reach 20 percent of the speed of light in about 4 minutes.  After a 20-year cruise, they would zip through the Alpha Centauri system in a few hours and send data and images back to Earth from the brief encounter.