Origins of Earth’s magnetic field remain a mystery: The existence of a magnetic field beyond 3.5 billion years ago is still up for debate

ScienceDaily | Apr 8, 2020 at 6:31 PM
  • But as intriguing as this origin story may be, an MIT-led team has now found evidence to the contrary.
  • The cooling and crystallization of the core stirs up the surrounding liquid iron, creating powerful electric currents that generate a magnetic field stretching far out into space.
  • Since 2001, Weiss and his group have been studying the magnetization of the Jack Hills rocks and zircon grains.