Number 55 (Story #4), November 7, 1991 by Phillip F. Schewe and Ben Stein|
NEWTON'S GRAVITATIONAL CONSTANT measured underwater is consistent with laboratory determinations to within less than 1 part in 1000. A Scripps/AT&T Bell Labs/Los Alamos team used a submersible craft to measure gravity in the oceans at depths up to 5000 m. The point here was to use the ocean as attracting mass in the search for deviations from Newton's inverse-square law for several distance scales. Assessing their own results and those emerging from measurements carried out by others in mines and boreholes, the scientists (M.A. Zumberge et al., upcoming article in Physical Review Letters) assert that "Collectively, these studies offer no compelling evidence for deviations from Newtonian gravity in the scale range 10 m to 1200 m."