Comet impacts formed the first continents on Earth.

The formation of early continents on Earth was caused by comet impacts as the Solar System passed through the spiral arms of the Milky Way galaxy.

Every 200 million years, minerals in the Earth's crust follow a rhythm of crust production.

which corresponds to the Solar System's transits through regions of the galaxy with a higher star density

"Every 200 million years, the Solar System orbits the Milky Way, passing between the galaxy's spiral arms."

We see a similar rhythm of crust production that corresponds to periods when the Solar System is active.

The findings connect the formation of planets to the movement of the Solar System through the Milky Way galaxy.

Only the larger rocky planets, such as Mars, Earth, and Venus, have active tectonic plates.

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