Phys.org  May 23, 2018 The idea behind the EmDrive is simple—it is a hollow cone made of copper or other material and placed in a frame. Natural microwaves bouncing around inside the cone are supposed to provide thrust. If feasible, such an engine could push a rocket through space without the need to carry fuel. But as many physicists have pointed out, such an engine would defy the laws of physics as we know them. To test this concept researchers in Germany built an EmDrive similar to the one NASA had looked at. They report that while the EmDrive did […]