Overview

• New research in Greenland has identified the earliest known evidence of Earth's magnetic field, dating back 3.7 billion years.
• The findings suggest that Earth's magnetic field was established much earlier than previously thought, providing crucial protection against solar radiation.
• This discovery was made possible by analyzing magnetite in ancient rocks, which preserved the magnetic signals.
• The intensity of the magnetic field at that time was measured at 15 microteslas, comparable to today's average field strength.
• The existence of an early magnetic field could have significantly influenced the development and evolution of life on Earth.