Earth's iron core

The hypothesis that Earth's center must be composed of denser material than its crust was confirmed through the study of meteorites. This led to the acceptance that Earth has a nickel-iron core, shaping our understanding of the planet's composition.
 Gabriel-Auguste Daubrée France 1866 Earth's iron core

The hypothesis that Earth's center must be composed of denser material than its crust was confirmed through the study of meteorites. This led to the acceptance that Earth has a nickel-iron core, shaping our understanding of the planet's composition.