Time travel has shifted from pure fantasy to a serious, if highly constrained, topic in modern physics. The equations that ...

New impressions A visualization of a curved space–time “sea” from the general-relativity simulations carried out by the authors.(Courtesy: James Mertens) From the Genesis story in the Old Testament to ...

110 years ago today, Albert Einstein published his General Theory of Relativity, which redefined the relationship between matter and gravity. Suddenly, our mysterious universe made a little more sense ...

Long and winding road: The Juice space probe taking the long way to Jupiter and its moons - Copyright NASA/AFP/File NASA Long and winding road: The Juice space probe ...

Astrophysics professor J. Richard Gott is continuing in Albert Einstein's route of research in general relativity. His recently released book, "Time Travel in Einstein's Universe," is widely ...

Diagrammatic representation of the entropic quantum gravity action. The action for gravity is given by the quantum relative entropy between the metric of the manifold and the metric induced by the ...

When black holes collide, the impact radiates into space like the sound of a bell in the form of gravitational waves. But ...