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A comment on Ancient shell shows days were half-hour shorter 70M years ago. Parent comment

Re:Ancient shell shows days were half-hour shorter 70M years... by saagarjha on Thursday March 12, 2020 @11:51AM (#22558071)
Since the magnetic field is tied to rotation of the planet’s core, I would expect it to slowly weaken as it caught up with the lack of rotation of the surface.
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