50 years ago, a new theory of Earth’s core began solidifying
Excerpt from the July 1, 1972 issue of Science News
![an illustratiion of a molten Earth's core](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2022/06/061422_no_50ya-earthcore_feat.jpg?fit=1030%2C580&ssl=1)
In the early 1970s, scientists proposed that Earth’s solid iron core formed as the planet came together, or accreted, rather than after.
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