Jupiter holds secrets in its heart that still baffle scientists. The largest planet in the solar system has what researchers call a “diluted core”: a central region that does not have as clear boundaries as expected. Instead of a distinct rocky center surrounded by layers of gas, Jupiter’s core regularly overlaps the hydrogen-rich layers above it, forming a smooth transition zone.
This strange structure was first discovered by NASA’s Juno spacecraft, which was orbiting Jupiter in 2016. The discovery surprised astronomers who had assumed that giant planets had cores with clearer boundaries.
The mystery increased when observations revealed that Saturn had a similar dilute core structure.
One explanation for Jupiter’s scrambled core involves a massive impact early in the planet’s history. Scientists hypothesize that a giant object — perhaps containing half the material in Jupiter’s core — collided with the planet in its infancy with such force that it completely scrambled the central region.
This collision was violent, mixing the dense rock and ice at Jupiter’s center with the lighter hydrogen and helium surrounding them.
A team of researchers decided to test the massive collision theory using powerful computer simulations to model what would happen when a giant object collides with Jupiter-sized planets.
The team ran some simulations using state-of-the-art software to test various impact scenarios, including extremely violent collisions, and employed new methods to accurately simulate the mixing of materials during these massive events.
The results were clear but unexpected; No simulations have produced a dilute core as stable as Jupiter’s, and computer models have shown that after a massive impact, the dense rocky material would quickly settle down again, forming a distinct boundary between the core and the outer hydrogen layers, in stark contrast to what Juno observed.
“We see in our simulation that this type of collision literally shakes the planet to its core, but not in the right way to explain the interior of Jupiter that we see today.”
The study was published in Monthly Observations of the Royal Astronomical Society, suggesting that Jupiter’s diluted core formed during more gradual processes.
Rather than being formed by a single massive collision, this often unconventional structure evolved like a growing planet, slowly absorbing both heavy and light matter during its formation billions of years ago. The theory of gradual formation gained support from the fact that Saturn also has a dilute core.
Dr. Louis Teodoro of the University of Oslo noted that Saturn’s similar structure strengthens the idea that dilute nuclei are not the result of rare high-energy events, but rather formed gradually during a long process of planetary growth and evolution.
These discoveries have consequences far beyond our solar system. Astronomers have discovered many planets the size of Jupiter and Saturn orbiting other stars. If dilute cores form gradually rather than in rare massive events, this suggests that most of these distant worlds may have similar complex interiors.
The research shows that while giant impacts certainly played important roles in planetary formation, they cannot explain every phenomenon we observe.
Scientists continue to study our stellar neighbors and the thousands of planets beyond them, and mysteries like Jupiter’s nucleus remind us that the universe still holds many surprises.
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