Why not? Light sails can reach 10% the speed of light, and sending out thousands of colony ships in multiple directions seems like a feasible way to colonize a

Why not? Light sails can reach 10% the speed of light, and sending out thousands of colony ships in multiple directions seems like a feasible way to colonize a galaxy relatively quickly. As the other poster mentioned, harnessing the sun's energy and turning it into a better form suited for light sails is the way to go. Sailing on the solar wind within a star system is a different tech with a different purpose.