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Neptune, sometimes considered the ninth planet from 1979–1999 when Pluto was classified as a planet and was temporarily closer to the Sun than NeptunePlanet Nine, hypothetical ninth planet in the outer Solar SystemPluto, considered the ninth planet from its 1930 discovery until it was reclassified as a dwarf planet … 展开
Ninth planet is a concept related to planets beyond Neptune.
Ninth planet or Planet Nine may also refer to: 展开CC-BY-SA 许可证中的维基百科文本 Planet Nine - Wikipedia
Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian objects (ETNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth i.e. over 250 astronomical units (AUs). These ETNOs tend to make their closest approa…
Wikipedia · CC-BY-SA 许可下的文字Planet X (disambiguation) - Wikipedia
- Planet X, a disproved hypothetical planet proposed in 1906 by Percival Lowell to have existed beyond the planet Neptune.
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Caltech Researchers Find Evidence of a Real Ninth Planet
网页3 天之前 · Caltech researchers have found evidence of a giant planet tracing a bizarre, highly elongated orbit in the outer solar system. The object, which the researchers have nicknamed Planet Nine, has a mass about …
Far Beyond Pluto, a Possible Planet Nine Awaits …
网页2016年1月20日 · Far Beyond Pluto, a Possible Planet Nine Awaits Discovery. An artist's concept of the possible ninth planet, dubbed Planet Nine, which is believed to exist because of the pull it exerts on the outer …
Planet Nine - Wikiwand
网页Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. Its gravitational effects could explain the peculiar clustering of orbits fo...
Planet Nine: Is the search for this elusive world nearly …
网页2024年6月14日 · Astronomers have been scouring the outer solar system for signs of a hypothetical ninth planet for almost a decade, without success. However, we may finally be on the cusp of finding it,...
How we discovered Planet Nine - Astronomy Magazine
网页2018年10月2日 · Planet Nine is by far the most likely explanation. So if it is really out there, when will we find it? The world has been alerted, and multiple teams are on the hunt.
Ninth Planet May Exist Beyond Pluto, Scientists Report
网页2016年1月20日 · Pluto, at its most distant, is 4.6 billion miles from the sun. The potential ninth planet, at its closest, would be about 20 billion miles away; at its farthest, it could be 100 billion miles...
New clues in search for Planet Nine - Science News
网页2016年7月5日 · A planet at least 10 times as massive as Earth and orbiting the sun once every 17,117 years would be in sync with four of these bodies, Malhotra and colleagues find. That puts Planet Nine, on...
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