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 ...

There is perhaps no location more terrifying than outer space, that infinite void where infinite multiverses expand in infinite directions at billions of kilometers per second. It’s an airless, ...

As the 21st century unfolds, radically different forms of air and space vehicles will replace the clunky machines of today, whisking passengers at ultra-high speed around the Earth and outward into ...