The impulse of photons would push the starship to a fraction of light speed. Riding a beam of light, a lightsail mission could reach Proxima Centauri in a couple of decades. But while the idea is ...

This animation details the piece-by-piece construction of the LightSail 2 spacecraft, as well as its maneuvers in space. Learn more at sail.planetary.org. The Planetary Society Some three ...