Earth’s Day Was Once Just 6 Hours Long
Shortly after the Moon formed about 4.5 billion years ago, Earth spun much faster, and a day lasted only about 6 hours. Tidal interactions with the Moon have slowed Earth’s rotation ever since.
Verified facts about our home planet — its rotation, geology, oceans, atmosphere, and place in the solar system.
Shortly after the Moon formed about 4.5 billion years ago, Earth spun much faster, and a day lasted only about 6 hours. Tidal interactions with the Moon have slowed Earth’s rotation ever since.
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