Add Yahoo as a preferred source to see more of our stories on Google. Researchers with the U.S. military's Defense Advanced Research Projects Agency (DARPA) have successfully used Earth's atmosphere ...

"The phenomenon is highly repeatable. We discovered an unplanned new technique for identifying objects entering the earth's atmosphere." When you purchase through links on our site, we may earn an ...

SpaceX wants to put American astronauts back in space aboard American-built rockets powered by American-built rocket engines. But will the American government give the company the chance? SpaceX ...

Lightweight fighter aircraft with no pilots could support conventional military missions while being easier to launch and recover. When you purchase through links on our site, we may earn an affiliate ...