Planet X, also known as Planet Nine, is a hypothetical planet that orbits the sun in the far outer regions of the solar system. To date, there are eight known planets in the solar system, but there may be more planets there. The planets are dark and small, so finding planets that are far away is extremely difficult. The existence of the ninth planet has been suggested in response to observations of distant objects called extreme trans-Neptunian objects (ETNOs). While observing a group of ETNOs, astronomers noticed that their orbits were slightly inclined in such a way as to suggest that there was a massive object in the outer solar system. Astronomers have estimated that the mass of this object is between five and ten Earth masses, making it a planet. Although there is some circumstantial evidence for the existence of Planet Nine, astronomers have not yet found concrete evidence that it exists. This means that very little is known about Planet Nine, and so far astronomers have only been able to predict its orbit, size and mass. If planet nine exists, it will probably be either super-Earth or mini-Neptune.
Orbit
The orbits of the planets in our solar system, including Neptune, furthest from our sun
If planet Nine existed, it would orbit the sun for an extremely long distance. Planet Nine is thought to orbit the sun for a maximum distance of 75 billion miles (120 billion kilometers), or about 26 times farther from the sun than Neptune. It will take the planet nine up to 20,000 Earth years to complete one orbit at such a great distance from the sun.
Formation
The gas giants in our solar system
There are two possibilities for how Planet Nine could have formed and been so far from the sun. Planet Nine is unlikely to have formed at an approximate distance from the Sun, so it most likely originated in the same region of the solar system as the gas giants. If Planet Nine formed closer to the Sun, the gravitational pull of Jupiter and Saturn would likely reject Planet Nine in the far outer regions of the solar system. Another possibility is that Planet Nine never actually formed in our solar system, and instead could be a planet that formed around another star. While this may seem strange, it is possible. Planet Nine may have formed in another solar system and was ejected during the formation of its solar system, passing through space until it orbits the sun. Another possibility is that our solar system has passed close enough to another solar system that Planet Nine was stolen from the sun.
Search for planet nine
So far, the only evidence for Planet Nine is ETNO’s inclined orbits. Unfortunately, this evidence is not enough to confirm the existence of Planet Nine. More direct evidence will have to be found to make Planet Nine real. Preferably, this evidence is in photographs taken by telescopes. Unfortunately, every search for Planet Nine turned out to be empty, but this does not necessarily mean that Planet Nine does not exist. Planet Nine may simply be so distant and obscure that telescopes will barely be able to spot it, and more modern technology may be needed. Astronomers will have to continue to explore the sky in the areas where Planet Nine is expected to be. If Planet Nine exists, it will probably be found in the near future.
Information about Planet Nine
Radius Two to four times larger than Earth
mass
Five to ten times the size of the Earth
Distance from the sun
75 billion miles (120 billion kilometers)
Duration of the year
20,000 Earth years
Aidan Remple June 7, 2022 at Science
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