Attention human. You are receiving an interstellar radio transmission. And it could be coming from one of the nearest ...

The nearest known alien worlds begin just over four light-years away around Proxima Centauri, the closest star to our Sun. Its system contains three reported planets, including Proxima b, a roughly ...

Laser sail propulsion is an idea that won't go away. By aiming powerful Earth-based lasers at tiny spacecraft with light sails, tiny spacecraft can be accelerated to near-relativistic speeds without ...