TESTING THE INVERSE-SQUARE LAW OF GRAVITY IN BOREHOLES AT THE NEVADA TEST SITE

Stacey et al. have reported evidence for a breakdown of Newtons law based on measurements in a deep mine. We have tested the reproducibility of this result by analyzing gravity data from boreholes in Nevada. One interpretation of our resuls suggests a breakdown of the Newtonian theory which is much larger than the effect previously reported. But the lack of consistency between the results suggests that it is not fundamental physics that has failed, but rather the experiments are subject to large systematic uncertainties which are caused by mass anomalies at intermediate distances from the holes. © 1990 The American Physical Society.