Billions of years ago, the average Earth day lasted less than 13 hours.
And our days are continuing to lengthen - all because of the Moon.
The Moon is edging away from our planet at a rate of 1.5 inches (3.8cm) every year. As it does so, our days are getting ever so slightly longer.
"It's all about tides," said David Waltham, a professor of geophysics at Royal Holloway, University of London.
"The tidal drag on the Earth slows its rotation down and the Moon gains that energy as angular momentum."
This increasing drag slows down our planet’s spin, while the Moon moves into higher orbit.
While a few centimetres a year doesn’t sound like much, over the course of the Earth's 4.5-billion-year history, it all adds up to a big change.
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