Yes. You can actually measure this just by the mass difference of a mountain here on Earth, with a sufficiently accurate pair of clocks. http://www.leapsecond.

Yes. You can actually measure this just by the mass difference of a mountain here on Earth, with a sufficiently accurate pair of clocks. http://www.leapsecond.com/great2016a/index.htm http://www.leapsecond.com/great2016a/index.htm