It may be four centuries since Newton's fateful day under the apple tree, but new measurements hint that we still don't quite understand gravity, Mark Haw finds.
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References
Wang, Q.-S. et al. Precise measurement of gravity variations during a total solar eclipse. Physical Review D 62, 041101(R) 2000.
Gillies, G.T. The Newtonian gravitational constant: recent measurements and related studies. Reports on Progress in Physics 60, 151 - 225 1997.
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Haw, M. What's the matter with gravity?. Nature (2000). https://doi.org/10.1038/news000824-1
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DOI: https://doi.org/10.1038/news000824-1