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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 ...

Before Einstein, physics looked almost finished. The universe seemed to behave like an excellent Swiss railway timetable. Matter moved. Forces acted. Time ticked away in the background like a reliable ...

Do claims about the future presently have truth values? Do objects have temporal parts? Is time travel possible? What does special relativity have to say about the previous questions? We will do some ...

Black hole singularities should not exist, according to theories of quantum mechanics. New tweaks to Einstein's equations of general relativity could finally do away with them, and explain what truly ...

Einstein's theory of general relativity is our best description of the universe at large scales, but a new observation that reports a "glitch" in gravity around ancient structures could force it to be ...

Astronomers have long been puzzled by a cosmic mystery: planets orbiting two stars—like Star Wars’ Tatooine—are surprisingly rare, even though they should be common. New research suggests the culprit ...