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The Pluto-size ball of solid iron that makes up Earth's inner core formed between 1 billion and 1.5 billion years ago, according to new research.
What's more, the new findings suggest that Earth's magnetic field, which is powered by the swirling flow of liquid iron surrounding the inner core, could continue going strong for quite a while, said study co-author Andy Biggin, a paleomagnetism researcher at the University of Liverpool in England. (Paleomagnetism is the study of the record of the Earth's magnetic field in rocks, sediment or archaeological materials.)
"The theoretical model which best fits our data indicates that the core is losing heat more slowly than at any point in the last 4.5 billion years and that this flow of energy should keep the Earth's magnetic field going for another billion years or more," Biggin said in a statement.
The first rocky bits of Earth coalesced around 4.54 billion years ago, less than 100 million years after the solar system formed. For much of those early years, Earth was a blob of molten rock, but over time, the surface cooled and formed a crust that floated on the Earth's liquid core. In time, the Earth developed an atmosphere, life, and the rest is, well, history.
At some point in this process, the liquid iron churning at the heart of the planet froze. Exactly when, however, remained a matter of hot debate; some scientists said it formed just 500 million years ago, while others said it formed about 2 billion years ago.
Read more here. (Live Science)
What's more, the new findings suggest that Earth's magnetic field, which is powered by the swirling flow of liquid iron surrounding the inner core, could continue going strong for quite a while, said study co-author Andy Biggin, a paleomagnetism researcher at the University of Liverpool in England. (Paleomagnetism is the study of the record of the Earth's magnetic field in rocks, sediment or archaeological materials.)
"The theoretical model which best fits our data indicates that the core is losing heat more slowly than at any point in the last 4.5 billion years and that this flow of energy should keep the Earth's magnetic field going for another billion years or more," Biggin said in a statement.
The first rocky bits of Earth coalesced around 4.54 billion years ago, less than 100 million years after the solar system formed. For much of those early years, Earth was a blob of molten rock, but over time, the surface cooled and formed a crust that floated on the Earth's liquid core. In time, the Earth developed an atmosphere, life, and the rest is, well, history.
At some point in this process, the liquid iron churning at the heart of the planet froze. Exactly when, however, remained a matter of hot debate; some scientists said it formed just 500 million years ago, while others said it formed about 2 billion years ago.
Read more here. (Live Science)
