Our planet's waistline is mysteriously increasing.
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References
Yoder, C. F. et al. Secular variation of Earth's gravitational harmonic J2 coefficient from Lageos and nontidal accleration of Earth rotation. Nature 303, 757 - 762 (1983).
Cox, C. M. & Chao, B. F. Detection of a large-scale mass redistribution in the terrestrial system since 1998. Science 297, 831 - 833 (2002).
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Secular variation of Earth's gravitational harmonic J2 coefficient from Lageos and nontidal accleration of Earth rotation. Nature (2002). https://doi.org/10.1038/news020729-9
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DOI: https://doi.org/10.1038/news020729-9