Led by Stephan Schlamminger in Gaithersburg, Maryland, the team reassembled apparatus from a 2013 Paris outlier experiment and began work in 2016.
Using concentric rings and multiple measurement methods, researchers obtained a value below both the 2013 result and the broadly accepted consensus, extending long-running disagreement over Big G.
Scientists say the work may still improve experimental methods and reveal past errors, but gravity remains the least precisely known fundamental constant despite decades of attempts.
Why does gravity, the force holding the universe together, remain the one fundamental constant science still can't accurately measure?
If the value of gravity is still in dispute, could our entire model of the universe's origin and expansion be fundamentally flawed?