Title: Were Newton and Einstein Right?


Newton postulated an inverse square law for gravity, yet there are essentially no experimental limits for violations of the inverse square law for distances less than a few millimeters. A growing number of theories predict inverse square law violation at the sub-millimeter range. First results from our group's experiment to test the inverse square law at sub-millimeter distances will be presented. Einstein's theory of general relativity requires that all forms of mass and energy, including gravitational self-energy, fall at the same rate in a gravitational field. Recent measurements of our group, when combined with lunar laser ranging data, provide a test of the gravitational acceleration of gravitational self-energy at the level of one part per thousand. These results will be presented.