Our early Solar System was home to dramatic planetary movements that created the possibility of life on Earth. Under this new theory, known as the Grand Tack, a Super-Earth could have formed via the constant accretion of small rocks in the early Solar System. Jupiter then formed in the periphery of the system. Through interactions with the Solar disk, the gas giant moved inwards, to about the position of Jupiter. The planetary migration of such a large planet threw the early Solar System into imbalance. Rocks that would be used to create large terrestrial planets, were ground down as they begin colliding at ever increasing rates. Our hypothetical Super-Earth would have been completely destroyed as chaos rocked the early system.
As Saturn began to form, a gravitational interaction known as a mean motion resonance developed with Jupiter. Under orbits in a low-integer ratio, the jovian giants tugged on each other periodically, dragging them further and further from the Sun. By this point, Jupiter and Saturn existed in the outer region of the Solar System, while the inner region was left with a smaller amount of rocks and volatile elements. Terrestrial planet formation would begin again – but with a twist. With less mass avaliable, planets developed to be small rocky worlds. Most importantly, these ‘second generation’ worlds harbored much thinner atmospheres than any predecessors would have, allowing for the hospitable conditions on Earth.