The formation of Uranus and Neptune in the Jupiter–Saturn region of the Solar System

摘要: Planets are believed to have formed through the accumulation of a large number small bodies1,2,3,4. In case gas-giant planets Jupiter and Saturn, they accreted significant amount gas directly from protosolar nebula after accumulating solid cores about 5–15 Earth masses5,6. Such models, however, been unable produce smaller ice giants7,8 Uranus Neptune at their present locations, because in that region Solar System planetary bodies will more widely spaced, less tightly bound gravitationally Sun. When applied current Jupiter–Saturn zone, recent theory predicts that, addition two or three other comparable mass likely formed9. Here we report results model calculations demonstrate such scattered outwards as Jupiter, perhaps nebular gas. The orbits these then evolve into resemble those Neptune, result gravitational interactions with outer disk nebula.