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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Did Gas from the Kuiper Belt Make Uranus and Neptune Rich in Carbon?

Scientists have found gas, especially carbon monoxide (CO), in icy belts around other stars — called exo-Kuiper belts. These belts are like our Solar System's Kuiper Belt, a region full of icy objects beyond Neptune. This discovery made scientists wonder: Did our Kuiper Belt once release gas too? And could that gas have added carbon to the atmospheres of planets like Uranus and Neptune? A new study suggests that the Kuiper Belt in our early Solar System may have been 20 to 50 times more massive than it is today. Over time, ice in the belt could have slowly released gas, which then spread across the Solar System. Planets like Uranus and Neptune, which have lighter atmospheres, could have easily absorbed this gas. This might explain why they have so much more carbon than Jupiter and Saturn. This theory also matches what we see in other star systems and helps explain the high carbon levels without needing the planets to form in special places. In short, the late gas from the Kuiper Belt could be the missing piece of the puzzle in understanding how outer planets got their unique atmospheres.


Scientists have found something interesting around other stars — belts of ice and dust, called exo-Kuiper belts, that also contain gas, especially carbon monoxide (CO). These belts look similar to the Kuiper Belt in our own Solar System, which is a ring of icy objects beyond Neptune.

This made scientists wonder:
Did our Solar System also have a gas-filled Kuiper Belt long ago?
And could that gas have changed the atmospheres of planets like Uranus and Neptune?

A new study says yes! It shows that gas from the young Kuiper Belt may have added a lot of carbon to these planets’ atmospheres.

Did Gas from the Kuiper Belt Make Uranus and Neptune Rich in Carbon?

🧊 What Is the Kuiper Belt?

The Kuiper Belt is a region of icy objects beyond Neptune. Pluto is one of them. It’s like a leftover part of the Solar System’s building blocks.

Some other stars also have similar belts — called exo-Kuiper belts. Scientists used powerful telescopes to look at these belts and found carbon monoxide gas (CO) in them.

This is strange because gas usually disappears early, in the first few million years after a star is born. But these belts still have gas even after 100 million years!

So where is that gas coming from?

💨 Late Gas: What Does That Mean?

Scientists believe this gas isn’t leftover from the star’s birth. Instead, it’s “late gas”, released much later.

How?

  • Small icy objects in the belts slowly release gas when they warm up or break.

  • This happens over millions of years.

  • The gas then spreads across the star system — both inward and outward.

This spreading gas might reach nearby planets.

🪐 What About Our Solar System?

Long ago, our Kuiper Belt may have been much bigger — 20 to 50 times more massive than today.

If so, it could have released a lot of gas, just like the exo-Kuiper belts we see today. This gas could have traveled inward and reached planets like Uranus and Neptune.

💡 Why Is This Important?

Uranus and Neptune have a lot more carbon in their atmospheres compared to the Sun — 50 to 80 times more. That’s a big mystery!

Until now, scientists thought these planets must have formed in a region rich in icy “pebbles” that carried carbon. But that doesn’t fully explain the high carbon levels.

This new study shows a better idea:
Maybe the extra carbon came from gas released by the Kuiper Belt later on.

🔬 What Did the Study Do?

Three scientists — Huet, Kral, and Guillot — created a computer model to test this idea. They checked:

  • How much gas the Kuiper Belt could release

  • How the gas moves through the Solar System

  • How much of it could be caught by Uranus, Neptune, and other planets

📊 What Did They Find?

If the early Kuiper Belt had 50 Earth masses of material, then:

  • Neptune’s atmosphere could become 30x richer in carbon

  • Uranus could become 20x richer

  • Saturn might increase 2x

  • Jupiter only a little: 0.2x

This matches what we actually see in those planets today.

🌬️ How Did the Gas Enter the Planets?

The outer layers (atmospheres) of Uranus and Neptune are light compared to the planet’s total mass. So even a small amount of incoming gas can change the atmosphere a lot.

That’s why the late gas could have had such a big effect on these planets.

🧪 What About Other Elements Like Sulfur?

Scientists also measured sulfur in these planets. The sulfur levels are high too, but not as much as carbon.

This shows that some carbon and sulfur may have come from early planet building, but the extra carbon likely came later — from Kuiper Belt gas.

🪐 Jupiter and Saturn: Less Effected

Jupiter and Saturn have heavier atmospheres and are farther from the Kuiper Belt, so the gas didn’t affect them as much.

But the small changes seen in their carbon levels still fit the model.

🌍 Could This Happen in Other Star Systems?

Yes! Many stars have exo-Kuiper belts with gas.

So, this same process might be happening in other planetary systems too — enriching planets with gas long after they form.

This could also help us understand the atmospheres of exoplanets (planets around other stars).

🔭 How Can We Check This?

Future telescopes will help us test this theory. Scientists will look at gases like:

  • Methane (CH₄)

  • Hydrogen cyanide (HCN)

  • Hydrogen sulfide (H₂S)

These gases help tell us the carbon and sulfur content of exoplanets.

New telescopes like James Webb Space Telescope (JWST), ELT, and others will help gather this data.

🔄 What If the Solar System Formed Differently?

Some scientists think the Solar System didn’t need a super-massive Kuiper Belt. Another model suggests the planets moved outward as the gas disc disappeared from the inside.

Even in that model, a smaller Kuiper Belt (just 5 Earth masses) could still release enough gas to affect Uranus and Neptune.

So, this theory works with different models of how the Solar System formed.

✅ What Does This All Mean?

  • A long time ago, our Solar System may have had a gas-rich Kuiper Belt.

  • That gas slowly moved inward and got caught by Uranus and Neptune.

  • This could explain why these planets have so much carbon in their atmospheres.

  • The same thing might be happening in other star systems, too.

  • Future telescopes will help us learn more by studying the atmospheres of exoplanets.

📘 Key Words Made Easy

  • Kuiper Belt: A ring of icy objects beyond Neptune (like Pluto).

  • Exo-Kuiper Belt: A Kuiper Belt around another star.

  • CO (Carbon Monoxide): A gas made of carbon and oxygen.

  • Late Gas: Gas released long after the planet system forms.

  • Sublimation: When ice turns directly into gas.

  • C/H Ratio: How much carbon there is compared to hydrogen in a planet’s atmosphere.

  • Viscous Spreading: Gas slowly moving inward and outward through space.

  • Nice Model: A model that explains how planets in the Solar System moved to their current spots.

Reference: Paul Huet, Quentin Kral, Tristan Guillot, "Late gas released in the young Kuiper belt could have significantly contributed to the carbon enrichment of the atmospheres of Neptune and Uranus", Arxiv, 2025. https://arxiv.org/abs/2506.03412


Technical Terms

🔹 Kuiper Belt

A region in our Solar System beyond Neptune filled with icy rocks, comets, and dwarf planets (like Pluto). It's like a cold, dusty ring around the Sun.

🔹 Exo-Kuiper Belt

A Kuiper Belt around another star (outside our Solar System). “Exo” means “outside.”

🔹 Carbon Monoxide (CO)

A gas made of one carbon atom and one oxygen atom. It can come out of icy objects when they warm up. It’s important because it carries carbon, which affects planet atmospheres.

🔹 Late Gas

Gas that is released long after a solar system forms — not from the original gas cloud, but from small icy bodies (like comets) slowly releasing it over millions of years.

🔹 Sublimation

A process where something solid (like ice) turns directly into gas without becoming liquid first. This happens when icy space objects warm up.

🔹 C/H Ratio (Carbon-to-Hydrogen Ratio)

A way to measure how much carbon there is compared to hydrogen in a planet’s atmosphere. A high C/H ratio means the planet has a lot of carbon.

🔹 Atmospheric Enrichment

When a planet’s atmosphere gets more of a certain element or gas — like carbon — than it originally had. It “enriches” the atmosphere.

🔹 Viscous Spreading

A process where gas slowly spreads inward and outward through the disk of material around a star, kind of like syrup spreading on a plate. It helps move gas toward planets.

🔹 Hydrodynamic Modeling

Using computer programs and equations to simulate how gas and liquids move in space, like in and around planets or disks.

🔹 Planetary Disk (Protoplanetary Disk)

A flat, rotating disk of gas and dust around a young star, where planets form. It’s like a big pancake of material spinning around the baby Sun.

🔹 Nice Model

A popular model (made in Nice, France) that explains how planets in the Solar System moved after they formed. It helps explain why the planets are where they are today.

🔹 JWST (James Webb Space Telescope)

A powerful space telescope launched in 2021. It helps scientists see faraway planets and stars, and study what their atmospheres are made of.

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