Origin stories of Earth and Mars involved massive collisions, not the slow buildup of pebbles

The video discusses two main theories of how Earth and Mars formed. The recent theory suggests planets formed by accreting millimeter-sized rocks from the outer solar system. However, a new study supports the classical model, which involves collisions between moon to Mars-sized planetary embryos. The study analyzed meteorites from Mars, comparing isotopes with those from Earth and other meteorites, concluding that only 4% of Earth and Mars material came from the outer solar system. The study also suggests Jupiter's early formation may have limited Earth's size by blocking incoming material.

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