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Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. [2] [4] 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 (AU).
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
His team has discovered many trans-Neptunian objects (TNOs). Particularly notable are Eris, a dwarf planet and the only TNO known to be more massive than Pluto, leading directly to Pluto's demotion from planet status; [2] [8] Sedna, a planetoid thought to be the first observed body of the inner Öpik–Oort cloud; and Orcus.
Scientists say they have found new evidence that there is a hidden planet in our solar system. For years, some astronomers have been suggesting that unusual behaviour on the edge of our solar ...
The missing Planet Nine is lurking somewhere in our solar system, and we're one step closer to discovering it. See why scientists think they can find Planet 9.
Planet nine may be orbiting far from the Sun, at the edge of our solar system. Astronomers, seeing odd irregularities in the orbits of the outer planets suspect another, unknown, planet may orbit ...
This giant planet may be hypothetical Planet Nine due to either the gravity of a nearby star or drag from the gaseous remnants of the Solar nebula which reduced the eccentricity of its orbit. A and B, two super-Earth (or even supergiant) planets theorized by Michael Woolfson as part of his Capture theory on Solar System formation. Originally ...
A newfound object nicknamed "The Goblin" lurking in the far reaches of our solar system could be yet another clue that points us toward the discovery of the theoretical Planet X, or Planet 9 — a ...