Short Wave Zircon: The Keeper Of Earth's Time
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Jan 10, 2023 
Nell Greenfieldboyce, an NPR science correspondent specializing in geology, dives into the fascinating world of zircon, the planet's oldest known mineral. She reveals that these resilient crystals date back 4.37 billion years, serving as geologic clocks that mark significant events in Earth's history. The discussion highlights how advancements in zircon research are unlocking secrets about early cosmic events, like the Moon's formation, as well as improvements in dating techniques using uranium decay. Zircon's durability makes it essential for understanding our planet's ancient past.
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Smithsonian Visit
- Nell Greenfieldboyce visited the Smithsonian's National Museum of Natural History and saw zircons.
- These tiny crystals, found in rocks, are the oldest known pieces of Earth.
Time Lords
- Zircons are called "Time Lords" due to their ability to act as geologic clocks.
- They help determine the timing of major geological events.
Ancient Zircons
- The oldest zircons are 4.37 billion years old, dating back to shortly after Earth's formation.
- They offer insights into Earth's early history, shortly after the moon's formation.