Newton's Law of Gravity Just Passed Its Biggest Test Ever

A new large-scale study of distant galaxy clusters found that gravity still follows Newton’s inverse-square law.

Researchers tracked the motions of hundreds of thousands of galaxies across billions of light-years and saw results consistent with standard gravity.

The findings strengthen the case for Newtonian/Einsteinian gravity and the need for dark matter to explain missing mass.

This is the biggest observational test yet of gravity on cosmic scales and helps rule out some modified-gravity ideas.