There was a time in Earth's turbulent history when everything almost slowed to a standstill.
Wondering what may have tripped early Earth into a period of relative stability, Mitchell and Kirscher looked to other major events in our planet's rocky history.
Solar atmospheric tides are not as strong as oceanic tides governed by the gravitational pull of the Moon. But when planet Earth spun faster in the past, the Moon's tug would have been weaker – one-fourth of its current strength.
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