Light from a distant galaxy becomes warped as it travels through space-time gravitationally curving around a foreground ...

By studying galaxy clusters separated by hundreds of millions of light-years, Penn physicist Patricio Gallardo and collaborators show that the laws of gravity described by Newton and Einstein still ...

This wasn't some sudden lightning bolt of inspiration. Newton spent years developing his ideas about gravity, working through mathematical proofs and observations. The apple was merely the beginning ...