Science Boy talking about the Grand Tack The Grand Tack is a scenario for early inner Solar System evolution. The `Grand Tack' model proposes that the inner Solar System was sculpted by the giant planets' orbital migration in the gaseous protoplanetary disk. Jupiter first migrated inward then Jupiter and Saturn migrated back outward together. There is a good deal of debate on the physical mechanism governing the very early stages in our solar system formation. Science Boy also formulated his own theory about Pluto and how Pluto settled down it's orbit after being affected by Jupiter and Saturn.  

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https://youtu.be/f6uhoRU_8og