A Special Place for Blog Lovers with a Touch of Science!

Enjoy our special posts in the fields of Earth & Planetary Sciences (EPS Blog) and Social Sciences & Arts (SSA Blog)

A Special Place for Blog Lovers with a Touch of Science!

How did Earth avoid a Mars-like fate?

Credit: Getty images

Earth's solid inner core formed 550 million years ago and restored the planet's magnetic field

Approximately 1,800 miles beneath our feet, swirling liquid iron in the Earth's outer core generates the planet's protective magnetic field. The magnetic field is invisible but is vital for life on Earth's surface because it shields the planet from the solar wind—streams of radiation from the sun.

 About 565 million years ago, however, the magnetic field's strength decreased, to a level of only 10% of the strength it has today. Then, mysteriously, the field bounced back, regaining its strength just before the explosion of multicellular life on Earth.

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