Earth’s rotation wobbles. NASA says humans partly to blame.

NASA scientists have discovered three factors that influence Earth's rotational wobble. Thankfully, while the Earth may wobble, it won't fall down.

Photo by NASA/Apollo 17 Crew
  • Despite what your classroom globe taught you, Earth is neither a perfect sphere nor does it rotate resolutely along its axis.
  • Scientists originally thought glacial rebound was responsible for Earth's polar motion, but a new study argues that mantle convection and contemporary ice mass loss share the blame.
  • The study's authors note that this new understanding of axial spin provides another link between ice melt and rising sea levels, allowing us to more accurately model global climate change.
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