In relativity, it is possible to conceive of tachyons, travelling outside the light cone. But in Wheeler and Spencer’s model, that is inconceivable, since the cone is actually defined by the set ...

This is a light cone. A mirror image of the cone can also extend backwards, behind the sheet of paper; it will contain all possible pasts that could have led to the original event.

Special relativity tells us one thing: that there exists an invariant speed, which we call the (vacuum) speed of light, and which is the same for all observers. This statement has the following ...

The past light cone of B, because it is in the future light cone of A, must have parts of its own past light cone outside of A's past light cone. Now here was Popper's correct point.

Astronomy Special relativity explained: Einstein's mind-bending theory of space, time and light Astronomy New theory could finally make 'quantum gravity' a reality — and prove Einstein wrong ...

McGucken’s light cone artwork started with some 3D printing of the cones. But then, a few months ago, he got the idea of representing them with a drone—or, as he says, “painting with light.” ...

THE fundamental postulate of the special theory of relativity, ... That is to say, it is asserted that causal links and links of information outside the light cone do not exist, ...

What is relativity? Succinctly put, it is the notion that the laws of physics are the same everywhere. We here on Earth obey the same laws of light and gravity as someone in a far off corner of ...

A light-speed event requires an even faster camera. A new camera setup has captured the first film of a photonic Mach cone – basically, a sonic boom with light – in real time.

Special relativity is also based on a second assumption that gives the speed of light — 186,000 miles per second (300 million meters per second) — in a vacuum a special status.