We have observed the gravitational field generated by lead balls. The classic example is the Cavendish experiment [1] which is rather important historically for

We have observed the gravitational field generated by lead balls. The classic example is the Cavendish experiment [1] which is rather important historically for figuring out the value of the gravitational constant. [1] https://en.wikipedia.org/wiki/Cavendish_experiment https://en.wikipedia.org/wiki/Cavendish_experiment