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 ...

Albert Einstein's general theory of relativity is one of the towering achievements of 20th-century physics. In our introduction to general relativity, we explain how this theory developed ...

For decades, physicists have struggled to reconcile the laws governing the very small with those that describe the vast ...

Since its introduction in 1915, general relativity has been remarkably successful in explaining astrophysical and cosmological phenomena, including the formation of black holes, the structure of ...