Summary:

- A cataclysmic solar storm hit Earth around 2,687 years ago, as evidenced by radioactive carbon-14 levels found in ancient tree rings.
- This solar storm was likely one of the most powerful in the last 11,000 years, and may have had significant impacts on ancient civilizations at the time.
- The discovery of this ancient solar storm highlights the importance of understanding space weather and its potential impacts on modern technology and infrastructure.