Ever wondered what gravity really is? Is it a force, or is there more to it than we know? In this video, we break down the ...

From a distance, general relativity does a great job describing black holes. But take a closer look and things get weird. First, consider what happens at the very heart of a black hole. According to ...

The unification of relativity and thermodynamics has been a subject of considerable debate over the past 100 years. The reasons for this are twofold. First, thermodynamic variables are non-local ...

Discover how Einstein’s theory of special relativity reshaped physics by linking space, time, mass, and energy in a universe governed by the speed of light.

The idea of “relativistic mass” is very old and was popularized by Arthur Eddington, the astronomer whose 1919 solar eclipse expedition validated Einstein’s theory of General Relativity, but ...

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, type ...

Relativistic mass-energy is still more mass-energy and still distorts spacetime more. To get a massive object to move relativistically, you need to add a whole lot of energy, ...

Everyone knows that relativity plays hell with time, and that it can do a number on space, but what about mass? Why do objects get more or less mass depending on their relative speed?

Einstein's theory of relativity is one of the most famous scientific ideas of the 20th century. Here are examples of how relativity can be seen in real life.