China has unveiled what it claims will be the world's first sixth-generation fighter jet, but it currently only has a mockup, and its goals may be too lofty.
Starlink, the satellite internet constellation owned by the Elon Musk-founded SpaceX, is not the only of its kind. But are there any real alternatives?
Unlike cruise missiles — which can travel close to the ground, are hard to detect, and can use GPS or be manually guided toward their marks — ballistic missiles are instead fired high into the air ...