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cover of episode The Times They Are a-Changin'

The Times They Are a-Changin'

2024/9/13
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Paleontologist Neil Shubin explains how corals, through their growth rings, reveal that years were once longer, containing over 400 days. These ancient coral calendars offer a glimpse into a time when Earth's rotation was faster, resulting in shorter days and longer years, as confirmed by studies on various fossilized shellfish.
  • Ancient corals have growth rings similar to trees, marking daily and yearly cycles.
  • Fossil corals reveal years used to have 400+ days.
  • The number of days in a year has decreased over millions of years.

Shownotes Transcript

This episode first aired back in December of 2013, and at the start of that new year, the team was cracking open fossils, peering back into ancient seas, and looking up at lunar skies only to find that a year is not quite as fixed as we thought it was.

With the help of paleontologist Neil Shubin, reporter Emily Graslie and the Field Museum's Paul Mayer we discover that our world is full of ancient coral calendars. Each one of these sea skeletons reveals that once upon a very-long-time-ago, years were shorter by over forty days. And astrophysicist Chis Impey helps us comprehend how the change is all to be blamed on a celestial slow dance with the moon. 

Plus, Robert indulges his curiosity about stopping time and counteracting the spinning of the spheres by taking astrophysicist Neil deGrasse Tyson on a (theoretical) trip to Venus with a rooster and sprinter Usain Bolt.

We have some exciting news! In the “Zoozve)” episode, Radiolab named its first-ever quasi-moon, and now it's your turn! Radiolab has teamed up with The International Astronomical Union to launch a global naming contest for one of Earth’s quasi-moons. This is your chance to make your mark on the heavens. Submit your name ideas now through September, or vote on your favorites starting in November: https://radiolab.org/moon)

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Leadership support for Radiolab’s science programming is provided by the Gordon and Betty Moore Foundation, Science Sandbox, a Simons Foundation Initiative, and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.