It has been about two years since Yuri Milner announced his most audacious piece of science-focused philanthropy: Breakthrough Starshot, an attempt to send hardware to Alpha Centauri by mid-century.

Kāholo stretches its legs on Puget Sound, powered by a new set of offshore-ready sails. Tor Johnson If sails are the engines of the sailboat, my engines were sputtering. After 13 years of use, ...

ESA engineers are looking at using the world's thinnest known material to build lighter, more efficient solar sails. By making sails out of one-atom-thick graphene sheets, the space agency aims to ...