A Gravitational Tug Deep Inside Earth May Explain Why the Length of a Day Shifts Over Decades
Nature World News | 03.10.2026 03:00
A day on Earth is not always exactly 24 hours, and new research points to a hidden cause thousands of miles beneath our feet. A study published Sept. 23 in the journal Nature concludes that a gravitational tug between Earth's solid inner core and its rocky mantle is the main driver of small changes in day length that unfold over several decades.
