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Before and after planet migration Courtesy David Kring, Center for Lunar Science and Exploration, and the Lunar and Planetary Institute In the image at right, the giant planets have migrated to the current orbits. This allowed their gravitational forces to destabilize the extension of the primordial asteroid belt closest to Mars. This drove numerous big impactors onto orbits where they co
Courtesy David Kring, Center for Lunar Science and Exploration, and the Lunar and Planetary Institute