'How planets revolve' is possibly one of the first extraterrestrial phenomena that educators taught students at school. They are told that in this phenomenon, the planets move around the sun in fixed ...

Discovering a machine that could somehow produce thrust without releasing propellant would be a game-changer for human space travel. There’s just one problem—such a device would defy the laws of ...

Gravity is the most familiar of nature’s forces. It keeps our feet planted on the ground and dictates the movements of ...