How big is Big G? Mystery deepens after ten-year effort to measure gravity’s strength0

• SCIENCE
• April 22, 2026

Stephan Schlamminger (left) and colleague Vincent Lee with the equipment used to measure big G.Credit: R. Eskalis/NIST The value of the constant that describes the gravitational pull between objects, Big G, continues to baffle scientists. A decade-long replication experiment1 that involved moving equipment across the Atlantic has resulted in a number that disagrees with previous