Mythic Planet X is an interesting thing because that allows the way to the perfect stealth technology.

 Mythic Planet X is an interesting thing because that allows the way to the perfect stealth technology. 

Could a hypothetical Planet X tunnel all radiation? 

The myth of Planet X still lives. Nobody ever saw that planet, and the thing that supports the theory of previously unknown large-size planets in Kuiper's belt are mysterious anomalies in Neptune's trajectory. The thing is that nothing else supports the theory of the existence of the "invisible planet". The size of the planet must be very big. And its gravitational field strong that it can affect Neptune's trajectory. 

And the search for that mysterious planet is very long work. In some visions, the mysterious gravitational source is mentioned as the small black hole, but nobody understands why that black hole doesn't seem to interact. 

In some other theories, Planet X is a glimpse of dark matter. And that thing makes it invisible. But there is one weakness. The dark matter object must have some kind of gravitational interaction with its environment. That means it should affect the rings of giant planets and other very lightweight objects. 

The most interesting question is could there be less than zero Kelvin degrees on that hypothetical planet? If the entire atmosphere on that planet is frozen and cosmic ions along with weak solar wind are traveling over its surface. Those things act like heat pumps. In that model Planet X's magnetic field acts like Earth's magnetic field. But it is smaller, and in that model Planet X is in a similar position to Uranus. 

"The two spheres represent holes in an ordered magnetic array of spins (illustrated with compasses). Due to this magnetic environment, the hole dopants bind in pairs. Credit: Christoph Hohmann, Munich Center for Quantum Science and Technology" (ScitechDaily.com/Unlocking the Mystery of Unconventional Superconductivity: A Breakthrough Experiment)

If planet X superconducts there is no radio reflection from its surface. 

So those particles and wave movement that travels over the planet will travel past the planet's surface. And in that case, they can form a situation where the surface temperature of that hypothetical planet is zero kelvin or even below zero kelvin. The particles and EM-radiation transfer energy away from that planet's surface. In some other models, the temperature on that planet is the same at all points. And if its temperature is the same as the background it is invisible to infrared sensors. 

In some models, Planet X lies like Uranus. The ion cloud around that planet can form the radiation pike that points to the sun. That radiation pike comes from the planet's poles. And in that version, the radiation pike just pushes particles and radiation to a shape that looks like a cone. That cone will push radiation past that planet. And that thing can deny the echo from that planet. 

But then we can think of another thing. Could it be possible that the entire planet consists of superpositioned and entangled particle series? Those things would make the quantum channels that are making radiation quantum tunnel through the entire planet. In that model, there is no reflection of the sun. 

In very low temperatures, there is a possibility that the material that forms the large-size but the very cold planet is forming the quantum rolls. In that model, those quantum rolls will transmit all radiation over the planet. And that thing means that there is no reflection. Those models are possible if that planet is far away from Neptune's trajectory. And this mythic planet may be also behind the Kuiper's belt. 

Above: quantum tunneling. Without reflection that energy impulse will not reach the sender. 

If 100% of radiation tunnels through the material it's invisible. 

The invisible planets and materials are important things. If some material superconducts. Radio waves are traveling through it. Because there is no resistance, electromagnetic radiation tunnels itself through that material. That means there is no reflection. If 100% of radiation tunnels through a layer that causes a situation where no radiation in that frequency cannot jump back to the transmitter. 

But the problem is that radio waves are easier to get pass through the material than photons. In some models in the graphene net. Electrons that are in the squares are forming quantum rolls. Those quantum rolls make wave movement and photons travel inside the material. 

One version of stealth technology is that quantum entanglement makes the quantum rolls that are pushing radio waves and photons inside the structure. In that model, the quantum entanglement drives the electromagnetic radiation and particles inside it. And then there is the antenna in the middle of the structure. That antenna aims the radiation in the wanted direction. 

https://scitechdaily.com/unlocking-the-mystery-of-unconventional-superconductivity-a-breakthrough-experiment/

https://solarsystem.nasa.gov/planets/hypothetical-planet-x/in-depth/