The Fifth Giant is a hypothetical ice giant proposed as part of the Five-planet Nice model, an extension of the Nice model of solar system evolution. This hypothesis suggests that the early Solar System once contained a fifth giant planet in addition to the four currently known giant planets: Jupiter , Saturn , Uranus , and Neptune . [ 1 ]

The Fifth Giant is a planet proposed by the Five-planet Nice model and the Jumping-Jupiter scenario, theorized to have orbited between Saturn and Uranus during the early formation of the Solar System. Over time, Neptune migrated outward, disturbing the Fifth Giant’s orbit.

第五氣體巨行星，也稱為 第五巨行星，是一顆存在於40億年前的 假想行星。 這顆行星於2011年被理論化。 太陽系中第五顆氣態巨行星的理論來自2011年的一個學說，該理論認為一顆額外的 冰巨星 正好位於 天王星 和 土星 的軌道之間。 隨著時間的推移，假設的行星質量對土星和天王星施加了力，最終將這三顆行星緊緊地綁在一起，在足够的引力下，土星和天王星的引力將這顆氣態巨行星拋出了我們的太陽系 [1]。 這是假設，但網上消息稱，這顆氣態巨行星的平均半徑為23,500 …

太阳系中第五颗气态巨行星的理论来自2011年的一个学说，该理论认为一颗额外的 冰巨星 正好位于 天王星 和 土星 的轨道之间。 随著时间的推移，假设的行星质量对土星和天王星施加了力，最终将这三颗行星紧紧地绑在一起，在足够的引力下，土星和天王星的引力将这颗气态巨行星抛出了我们的太阳系 [1]。 这是假设，但网上消息称，这颗气态巨行星的平均半径为23,500公里。 周长约为147,655公里，其直径约为47,000公里。 根据 航海家2号 对天王星和 海王星 的研究，气态巨 …

It begins with five giant planets, the four that exist today plus an additional ice giant between Saturn and Uranus in a chain of mean-motion resonances.

2011年9月22日 · That’s the conclusion from a computer simulation of the solar system’s evolution, which suggests the fifth giant was hurled into interstellar space some 4 billion years ago, after a violent...

2011年9月13日 · Recent studies of solar system formation suggest that the solar system's giant planets formed and migrated in the protoplanetary disk to reach resonant orbits with all planets inside 15 AU from the Sun.

2015年9月17日 · Statistically, some of the most successful dynamical evolution simulations have initially included a hypothetical fifth giant planet, of ice giant mass, which gets ejected by a gas giant during the early solar system's proposed instability phase.

2015年11月3日 · The existence of a fifth giant gas planet at the time of the solar system’s formation — in addition to Jupiter, Saturn, Uranus and Neptune that we know of today — was first proposed in 2011. But if it did exist, how did it get pushed out? For years, scientists have suspected the ouster was either Saturn or Jupiter.

2015年8月11日 · A cluster of icy bodies in the same region as Pluto could be proof that our early solar system was home to a fifth giant planet, according to new research. That planet may have "bumped" Neptune during its migration away from the sun 4 billion years ago, causing the ice giant to jump into its current orbit and scattering a cluster of its ...