A team of physicists has used a pair of vibrating rods to measure the gravitational constant to incredibly fine precision.
While the new technique has relatively high uncertainty, they hope that future improvements will provide a new pathway to nailing down this elusive constant.. Isaac Newton first introduced the constant into his equations when he developed his universal theory of gravitation over 300 years ago.
We cannot calculate the value of this constant from any theory. We can only discover it through measurement and experimentation. "The only option for resolving this situation is to measure the gravitational constant with as many different methods as possible," explains Jürg Dual, a professor in the Department of Mechanical and Process Engineering at ETH Zurich. Dual led a team to develop aDual and his team started with a suspended metal bar. They then vibrated the bar and measured how much an adjacent bar also vibrated. The two bars weren't touching.
The measurement of the gravitational constant that the team produced is about 2.2 percent higher than the currently accepted value, but it does have a large uncertainty.
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