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Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. [4] [2] 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).
In a simplified model where all objects orbit in the same plane and the giant planets are represented by rings, [F] objects captured in strong resonances with Planet Nine could remain in them for the lifetime of the Solar System. At large semi-major axes, beyond a 3:1 resonance with Planet Nine, most of these objects would be in anti-aligned ...
Scientists say they have found new evidence that there is a hidden planet in our solar system. ... That helps explain the orbits of objects that lie at the very far reaches of our solar system ...
Parts-per-million chart of the relative mass distribution of the Solar System, each cubelet denoting 2 × 10 24 kg. This article includes a list of the most massive known objects of the Solar System and partial lists of smaller objects by observed mean radius. These lists can be sorted according to an object's radius and mass and, for the most ...
The number of known planets in our solar system has risen and fallen over time. Planet nine may be orbiting far from the Sun, at the edge of our solar system. Astronomers, seeing odd ...
Planet Nine, hypothetical ninth planet in the outer Solar System Pluto , considered the ninth planet from its 1930 discovery until it was reclassified as a dwarf planet in 2006 (except 1979–1999, see above)
It's the same for the second- and third-closest planets, and the third- and fourth-closest planets. The two outermost planets complete an orbit in 41 and 54.7 days, resulting in four orbits for ...
Both planets have a density less than that of water, similar to Saturn. The innermost planet, Kepler-9d, is a super-Earth with a radius that is 1.64 times that of Earth, [13] [12] orbiting the star every 1.6 days. It is estimated that there is a 0.59% chance that the discoveries are false. [12]