Early continents formed by comet impacts

Conventional wisdom that the continents on Earth were only produced by processes within the planets is being challenged by a new study.

The findings suggest that comet impacts during the early Solar System formed the first continents on Earth.

The minerals in the Earth's crust, according to the researchers, follow a rhythm of crust creation that occurs roughly every 200 million years.

passes across regions of the galaxy having a higher star-density than the Solar System

It was fueled by a number of reasons, including water that percolated deep below the crust and impacts from massive meteorites.

Every 200 million years or so, the Solar System passes between the spiral arms of the Milky Way as it revolves around it.

By examining the age and isotopic signature of minerals from both Western Australia's Pilbara Craton and

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