A day on Earth was a half-hour shorter just 70 million years ago

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A day on Earth was just 23.5 hours long, 70 million years ago.
Researchers discovered this by studying the growth rings of ancient mollusk fossils.
The findings could tell us more about or planet and its relationship with the Moon.
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A full day on Earth hasn’t always been 24 hours long. A new study reveals that a day on our planet once lasted approximately 23.5 hours, and it wasn’t that long ago that days were significantly shorter. The finding was made possible by studying the fossilized shells of a mollusk that died 70 million years ago.

By closely examining the growth things of the mollusk shells, and knowing what they already know about how fast mollusk shells grow, the researchers were able to measure the number of days in a year. When the mollusks lived — some 70 million years ago — there were actually 372 days in a year instead of 365, and each day was roughly a half-hour shorter than our days are now.

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A day on Earth was a half-hour shorter just 70 million years ago originally appeared on BGR.com on Tue, 10 Mar 2020 at 18:04:53 EDT. Please see our terms for use of feeds.