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If microorganisms could survive a journey through space inside meteoroids, could life from Earth be transferred to planets in other solar systems—or even vice versa? A new study suggests the possibility is much higher than scientists once thought.

Using computer simulations involving slow-moving rocks, scientists from Princeton University, the University of Arizona, and the Centro de Astrobiología (CAB) in Spain concluded that Earth could have exchanged rocks trillions of times with planets from other planetary systems during the solar system's infancy.