A ghost planet, 1.5 to 3 times the mass Of those on Earth, it could be hiding in the solar system, in the Kuiper Belt that extends beyond the orbit of Neptune.
This is shown by simulations published in The Astronomical Journal by two Japanese astrophysicists, Patrick Sofia Likaoka of Kindai University in Osaka and Takashi Ito of the National Astronomical Observatory of Japan.
In the past decade, many studies have hypothesized the existence of a planet at the edge of the solar system, called Planet Nine. However, this new research suggests there may be a planet closer to us, in the Kuiper Belt.
This ring-shaped region contains many small objects, such as asteroids, comets and other small pieces of material, possibly made of ice. The two Japanese astrophysicists noticed that some of these objects behave erratically, as if their orbits were affected by the gravity of a larger object. Following this data, they ran a series of computer simulations to search for an explanation.
The results indicated the possibility of the existence of a planet in the Kuiper Belt. According to the calculations, it should have a mass of 1.5 to 3 times that of Earth, an inclination of about 30 degrees, and an orbit that would put it at a distance from the Sun of 250 to 500 astronomical units (one astronomical unit is the distance between Earth) than our Sun, which is about 149.6 million kilometer).
With information from ansa.it
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