WE propose to show that the constancy of rest mass during non-uniform movement is by no means a general feature of restricted relativity. It applies only to a special, though very important ...

"The singularity is the most mysterious and problematic part of a black hole. It's where our concepts of space and time ...

While they zip around at relativistic speeds, gaining effective relativistic mass, the two outermost electron shells (also ...

Meanwhile general relativity has never been found lacking. Its prediction that very dense agglomerations of mass could warp space-time so much that not even light could escape from it has proved ...

Einstein’s big idea was the strange concept of space-time - the notion that space and time are woven together, and become distorted by objects with mass. Ten years before general relativity ...