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Planet X, a disproved hypothetical planet proposed in 1906 by Percival Lowell to have existed beyond the planet Neptune. Colloquially, and by extension, any hypothetical trans-Neptunian planet, in particular Planet Nine. 展开
• Planet X (Derek Sherinian album), 1999
• Planet X (Helios Creed album), 1994
• Planet-X, an album by bassist Jimmy Johnson
• Planet X (band), a progressive metal band founded by Derek Sherinian 展开• Planet X, the home planet of Marvel Comics character Groot and other flora colossi
• "Planet X" … 展开• Nibiru cataclysm, a supposed impending disastrous encounter between Earth and a large astronomical object
• Operation Planet X, a military operation during the Iraq War in 2003 展开CC-BY-SA 许可证中的维基百科文本 Planets beyond Neptune - Wikipedia
In 1894, with the help of William Pickering, Percival Lowell (a wealthy Bostonian) founded the Lowell Observatory in Flagstaff, Arizona. In 1906, convinced he could resolve the conundrum of Uranus's orbit, he began an extensive project to search for a trans-Neptunian planet, which he named Planet X, a name previously used by Gabriel Dallet. The X in the name represents an unknown …
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Nibiru cataclysm - Wikipedia
网页Lieder described Planet X as roughly four times the size of Earth, and said that its closest approach would occur on May 27, 2003, resulting in Earth's rotation ceasing for exactly 5.9 terrestrial days.
Hypothetical Planet X - NASA Science
网页2015年1月20日 · This hypothetical Neptune-sized planet orbits our Sun in a highly elongated orbit far beyond Pluto. The object, which the researchers have nicknamed "Planet Nine," could have a mass about 10 times that of …
The Case Strengthens for Planet 9 | News | Astrobiology
网页2024年9月12日 · The race is on to find the giant planet that several teams of astronomers are convinced orbits far out beyond Pluto, but is nonetheless still part of our Solar System. Proving the existence of what has become …
New object beyond Pluto hints at mysterious 'Planet X'
网页2018年10月2日 · The web page reports the discovery of 2015 TG387, a small, icy body that orbits far from the sun and may be influenced by an unseen Planet X. It also explains the search for Planet X and the …
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A Brief History of the Hunt for Planet X | Smithsonian
网页2015年12月15日 · Learn about the long and legitimate search for planets in the solar system's fringe, from Neptune to Pluto to Gna. Find out why some astronomers are …
The solar system's hidden Planet X may finally be …
网页2019年2月28日 · Astronomers who suspect a hidden planet known as "Planet X" or "Planet Nine" is affecting the comings and goings of icy objects beyond Neptune, say we could soon lay eyes on the distant ...
Planets beyond Neptune - Simple English Wikipedia, the free …
网页Today, the astronomical community widely agrees that Planet X, as originally envisioned, does not exist. A number of astronomers have used the concept of Planet X to explain …
Planet X? Why not a tiny black hole instead? - Ars …
网页2020年8月16日 · If planet X were indeed a black hole, how would we know? The researchers argue that dark-matter annihilation is the thing to search for. No one knows if primordial black holes exist.
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