1.   The crust is now also abnormally thick but gravity measurements indicate that it is in approximate isostatic equilibrium.

2.   But in addition to that effort, fleets of Navy ships spent decades making even more detailed gravity measurements in certain parts of the seas.

3.   In an accompanying article, several scientists cautioned that there could be other explanations of the gravity measurements and that it would be difficult to test which was correct.

4.   The satellite yielded the most comprehensive set of gravity measurements ever.