# Post

Originally shared by Dan PiponiBecause gravity is so weak, measuring the gravitational constant G is really hard. We know Planck's constant, say, to many more digits of accuracy. But worryingly, a new approach using atom interferometry gives a lower value for G than other methods.

http://www.nature.com/news/quantum-method-closes-in-on-gravitational-constant-1.15427

It would be really exciting if the lower result was a result of quantum mechanics being incompatible with classical gravity. But at the scale of this experiment these effects are probably not showing up.

http://www.nature.com/news/quantum-method-closes-in-on-gravitational-constant-1.15427

It would be really exciting if the lower result was a result of quantum mechanics being incompatible with classical gravity. But at the scale of this experiment these effects are probably not showing up.

Because gravity is so weak, measuring the gravitational constant G is really hard. We know Planck's constant, say, to many more digits of accuracy. But worryingly, a new approach using atom interferometry gives a lower value for G than other methods. http://www.nature.com/news/quantum-method-closes-in-on-gravitational-constant-1.15427 It would be really exciting if the lower result was a result of quantum mechanics being incompatible with classical gravity. But at the scale of this experiment these effects are probably not showing up.

Shared with: Public

+1'd by: Hunter Yavitz, Dave Wonnacott

Reshared by: Hunter Yavitz

*This post was originally on Google+*