EMDrives are claimed to be propellentless space propulsion systems. If propellentless propulsion is possible it could enable fast human travel throughout the solar system and possible interstellar ...

Scalar-tensor gravity represents a class of extensions to Einstein’s theory of general relativity in which the gravitational interaction is mediated not only by the spacetime metric but also by one or ...

VECTOR analysis is now recognised fully as furnishing standard modes of expression for many ranges mathematical and physical thought; and meanwhile, the atmosphere of the physical thought especially ...