The NIST explainer describes how scientists measure big G, the gravitational constant that sets the strength of attraction between two masses.

Both the historical Cavendish experiment and NIST's modern setup use a torsion balance: suspended masses twist slightly under gravitational attraction, and that small motion is measured.

I made two short looping animations in Blender using a flat cel-shaded style to match NIST's How Do You Measure It series.

One animation simplifies the Cavendish experiment. The other shows the NIST setup with four larger masses on a rotating outer carousel and four smaller masses on a suspended inner disk.