During the latter part of the 20th century, string theory was put forward as a unifying theory of physics foundations. String ...

Einstein believed that black holes didn't really exist. But they do: that much we know. We don't know much else about them.

“And that’s that.” Once while Einstein was working on the equations for general relativity, which would take him eight years to complete, he went mountain-climbing with the French-Polish ...

The behavior of spacetime is described by Einstein's equation (i.e. Einstein's field equations) from General Relativity. To ...

"The singularity is the most mysterious and problematic part of a black hole. It's where our concepts of space and time literally no longer make sense." ...

One of the first verified predictions of general relativity is the gravitational deflection of starlight. The effect was ...

All of this is calculated with the equations that underpin general relativity: Einstein's field equations. "The way that the space-time curves is determined by the Einstein field equations ...