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Passing through the Milky Way’s arms may have helped form Earth’s solid ground
Barrages of comets stirred up by the early solar system’s journey around the center of the galaxy could explain the timing of ancient rock formation.

Passing through the Milky Way’s arms may have helped form Earth’s solid ground

Barrages of comets stirred up by the early solar system’s journey around the center of the galaxy could explain the timing of ancient rock formation.