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29 Aug

Comet impacts formed continents when Solar System entered arms of Milky Way

New Curtin research has found evidence that Earth's early continents resulted from being hit by comets as our Solar System passed into and out of the spiral arms of the Milky Way Galaxy, turning traditional thinking about our planet's formation on its head. The new research, published in Geology, challenges the existing theory that Earth's crust was solely formed by processes inside our planet, casting a new light on the formative history of Earth and our place in the cosmos. Lead researcher Professor Chris Kirkland, from the Timescales of Mineral Systems Group within Curtin's School of Earth and Planetary Sciences, said studying minerals in the Earth's crust revealed a rhythm of crust production every 200 million years or so that matched our Solar...
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