Deep inside the distant planets Uranus and Neptune, matter may exist in a bizarre form unlike anything we experience on Earth.
A new study suggests that under the extreme heat and pressure found in these planets, a substance made of carbon and hydrogen could enter a rare state known as “superionic.”
The research, carried out by scientists Cong Liu and Ronald Cohen at Carnegie Science, was published in Nature Communications.
Uranus and Neptune are often called “ice giants,” but the word “ice” can be misleading.
Beneath their thick outer layers of hydrogen and helium, scientists believe these planets contain deep regions filled with hot, dense materials such as water, methane, and ammonia.
Under such extreme conditions, these substances don’t behave like normal ice, liquid, or gas. Instead, they can form unusual states of matter.
To better understand what happens in these hidden layers, the researchers used powerful computer simulations based on quantum physics. They modeled how carbon hydride—a simple combination of carbon and hydrogen—would behave under pressures millions of times stronger than Earth’s atmosphere and at temperatures of thousands of degrees.
Their results revealed something surprising. The atoms arranged themselves into a solid-like structure made mostly of carbon, forming a stable framework. But the hydrogen atoms did not stay fixed in place. Instead, they moved through the structure along spiral, almost corkscrew-like paths. This creates what scientists call a superionic state, where part of the material behaves like a solid while another part flows like a liquid.
What makes this discovery especially interesting is the way the hydrogen moves. In most superionic materials, atoms can move in all directions. But in this case, the hydrogen appears to move mainly along specific pathways, almost like cars traveling along narrow highways. This “one-dimensional” movement is highly unusual and could affect how energy and electricity move through the planet.
These findings may help scientists better understand how Uranus and Neptune work on the inside. For example, the way heat and electricity move through their interiors plays a key role in generating their magnetic fields. Unlike Earth’s relatively stable magnetic field, the magnetic fields of Uranus and Neptune are oddly shaped and tilted, and this strange internal behavior could be part of the reason why.
The study also has broader implications beyond our solar system. With more than 6,000 planets discovered orbiting other stars, understanding these extreme states of matter can help scientists interpret what distant worlds might be like deep inside.
Even though carbon and hydrogen are among the most common elements in the universe, this research shows that they can behave in surprisingly complex ways under extreme conditions. By exploring these exotic states, scientists are not only learning more about distant planets, but also uncovering new possibilities for materials science here on Earth.
Source: KSR.
