Hunt for the 9th planet
In the beginning, I must say that tracking the extremely cold planet from the Kuiper belt is not an easy thing and the name for that hypothetical planet is "planet nine"(1). The planet, if that exists would be covered by very bold ice, what temperature would be near zero kelvin. That means the infrared images are extremely hard to get from that object, and if it doesn't have moons, what would be water balloons, what is covered by ice, but what can be liquid because of the tidal forces, that means the planet would be extremely hard to find.
Tidal waves what massive planet causes can keep the water under ice core liquid, and in this case the water is like magma. This thing causes icy volcanoes on the surface of the Triton moon.
If the ice core of the planet would be hundreds of kilometers thick, that means that ice would isolate the vulcanic temperature of the planet itself. And in this case, the infrared telescopes cannot see the radiation, what comes from that planet.
The difference between planets and stars is that planets are not creating own light. They just mirror the light, what comes from stars, and the only radiation that they endemically create is the infrared radiation, which is forming when the radioactive materials in the nucleus of the planets are splitting. And if the planet is very dark, that means the visual image of the object is very hard to get.
Many times astronomers have said that there is not 9th planet, but the new hope to find that mysterious world woke up in 2013 when the WISE satellite uncovered the Luhman-16(2) system at 6,6 light-years from Earth, and that thing shows that there might be the mysterious planet quite near the solar system's outer border, somewhere in Kuiper's belt.
Could hypothetical "Nemesis-star" be a black hole(3)?
That would explain, why there are no visual observations of that object. The black hole would pull all radiation in it, and because of that, the thing, that astronomers can see is the transform disk around the singularity. And if there is no material around that object, that means that the black hole is very hard to detect.
The same way neutron star would turn to the pulsar, only if it can pull the material from other stars or interstellar nebulas, what is surrounding it. But if there is not that cloud, the pulsar is not forming, and sooner or later the cloud, what has fed the neutron star ends, which means that the pulsar will shut down.
Sometimes there have been introduced speculations that there is the brown dwarf near the Sun and that thing causes the mass-destruction on the Earth. The name for that hypothetical star has introduced "Nemesis". But we should locate that star very easily, by using the infrared telescopes.
Many times people have claimed that "Nemesis" would not exist because there are not infrared observations of that star. But the question is, "could the Nemesis-star" be the black hole (4), white dwarf or neutron star, what has been ended their internal energy production. So that would explain, why we haven't seen that hypothetical star.
Three reasons, why we haven't find the 9th. planet yet
1) There is no 9th planet
There is a possibility that the 9th planet does not exist, and the famous errors in the trajectory of Neptune are caused by the errors in measurements. The famous errors or differences between measured and calculated trajectories of planet Neptune are in the key role when the researchers are trying to find the mysterious planet from the Kuiper belt.
And there has been found a couple of large objects. But those objects are too small to cause errors in the trajectory of Neptune. So is the thing behind those "errors" only the measurement or calculation error.
2) There was the 9th planet, but it was just passed our solar system
Another explanation for the mysterious errors in the trajectories of Neptune is that there was a planet that just passed the solar system. That means that the errors in the trajectory were the errors, but they are happening only once.
2B) There is a possibility that the particles of the Kuiper belt have been drifted and caused the errors to the trajectory of planet Neptune. Maybe that drift has been in the line with Alpha Centauri, and that is caused by the errors in the trajectory of Neptune.
Or some moons of Neptune may have been in the same line with larger particles of Kuiper belt. That means that the errors in the trajectory of Neptune would be caused only by the drift of the material of the Kuiper belt.
The explanation of why we cannot see that planet could be answered by asking the question "who said that the thing, what passed our solar system was a planet"? That thing could be a neutron star or black hole. But that thing might be very easy to locate by using the X-ray images to track it.
3) There is something else than the planet
Sometimes there are introduced theories that in the Kuiper Belt are a small black hole or neutron star. That means that the black hole (4), what size would be something like the football would orbit the Sun in that distance. The reason why this theory has not got very much support is that there is not reported the reactions, what black hole should cause in the Kuiper Belt.
The thing is that the speculative black hole would interact with other particles and that thing would cause flashes in visual and infrared areas of the radiation. And that radiation would be easy to notice from the Earth. Also, Black Hole would make that the particles in the Kuiper Belt would start to drift around it.
But could that black hole be the "Nemesis" mythic star, what was claimed to cause the mass destruction in the cyclic periods? That means the black hole could orbit both, Alpha Centauri and the Sun, and that would explain, why we haven't got a single observation about that object, and the thing is that the "Nemesis" is still only the myth.
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