"Illustration of the hypothetical Planet 9. Credit: R. Hurt/IPAC, Caltech" (Phys.org/Planet 9 is running out of places to hide)
Hypothetical Planet 9 or 10, if you think that Pluto is the planet is a mystery. And maybe it remains a mystery. There are billions of theories about what that mystery could be. And nobody ever detected that planet. The only observations about that planet are gravitational interactions between something unseen and planet Neptune.
In some visions that planet would be a miniature black hole. Or maybe it was some rogue planet that traveled near our solar system. Nobody has seen that planet yet. But sometimes there is intensive research for finding that planet. But all attempts to find that mysterious gravitational object are failed.
The "Planet 9" is the name of an unknown anomaly in the trajectory of planet Neptune. And the thing is that Planet 9 is not a red dwarf called "Nemesis". There is suspicion that "Planet 9" is some kind of density in the Kuiper Belt.
Or it might be the cloud of dust just outside the Kuiper belt. One explanation for that "planet" is that the members of the Alpha Centauri system (Alpha Centauri A and B, Proxima Centauri, and Luhman-16) would go in a straight line. And that causes the gravitational anomaly.
There is also the possibility that the energy impulse from the black hole or somewhere else causes the anomaly in the trajectory of planet Neptune. The interesting thing about Planet 9 is that we cannot see it. The anomalies of the trajectory of the Neptune were real. But the thing that causes them remains a mystery.
One of the possibilities is that hypothetical Planet 9 kicked off from orbiting trajectory. The distance to that hypothetical object would be so high that even a small gravitational effect could pull that planet out from its trajectory.
Could planet 9 be some kind of rogue planet? In some hypotheses, planet 9 is the old planet from maybe the Van Maanen system. That means there is no radioactive material left. And that planet is the zombie. Maybe planet 9 just passed our solar system.
If we would find that planet the surface temperature of it could be the same as the cosmic background. Which is 3 kelvin. Or even lower. That makes that planet extremely hard to detect. If the temperature on that planet is lower than 3 Kelvin. That means energy travels to that planet. But even though the surface temperature is precise 3 kelvin that planet is hard to detect, because there is no infrared radiation.
The surface of that hypothetical planet would be in superconducting condition. And it makes the planet an extremely large size quantum hard disk where signals remain in their form. That means all radiation that is left from Earth and impacts Planet 9 will be stored on the surface of that planet in the form where it is transmitted.
But there is one interesting hypothesis. That is that Planet 9 is formed of dark matter. So planet 9 exists but the only observable thing about that planet is its gravitational field.
That means we could not see or touch that planet. That planet would be only the gravitational effect that will cause anomalies to the trajectory of Neptune. But the thing is that mystery remains. Planet 9 waits for its finder. And maybe that planet ever found. Today scientists have better tools than ever before. And they should find that planet. But if the "planet" is a small nebula where the bites are near zero kelvin, that thing is hard to see.
https://astronomy.com/news/2020/07/is-planet-nine-a-black-hole-or-a-planet-harvard-scientists-suggest-a-way-to-find-out
https://phys.org/news/2022-08-planet.html
https://www.space.com/dark-matter-planets-blown-up-detection
https://en.wikipedia.org/wiki/Planet_Nine
https://astronomyandtechnology.blogspot.com/
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