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Greenland rocks suggest Earth’s magnetic field is older than we thought

Analysis finds that the planet’s protective shield was in place by at least 3.7 billion years ago, as early life arose.
  1. Alexandra Witze
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Nature 576, 347 (2019)

doi: https://doi.org/10.1038/d41586-019-03807-7

References

  1. Tang, F. et al. Proc. Natl Acad. Sci. USA 116, 407–412 (2019).

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