Saturn's hexagon is one of the strangest features in our solar system. It is a giant cloud pattern, almost perfectly hexagonal, sitting right at Saturn's north pole.
It has been there for at least 40 years — longer than humans have been watching — and probably much longer than that. No other planet in our solar system has anything like it.
Earth's storms are roughly circular. Jupiter's storms are roughly oval.
Only Saturn has a hexagon.
How does a giant polygon form in something as flowy and messy as a planet's atmosphere? That's the question scientists have been working on since the 1980s. The answer, surprisingly, came out of a small rotating water tank in a lab in England. This is the full story.
Saturn's hexagon is a giant six-sided cloud pattern at Saturn's north pole. It is about 30,000 km across — wide enough to fit two Earths side by side inside it — and roughly 300 km deep.
Each of its six sides is about 14,500 km long, longer than Earth's diameter. The hexagon is made by a fast jet stream — a band of wind moving at about 320 km/h — flowing around Saturn's north pole in a six-sided shape instead of a circle.
It was discovered from Voyager spacecraft images in the 1980s and studied in detail by Cassini between 2006 and 2017.
Quick hexagon facts
A pocket-sized list of the most asked-about hexagon numbers.
| Location | Saturn's north pole — centred at about 78° north. |
| Total width | About 30,000 km across — wide enough for two Earths to fit side by side inside it. |
| Side length | Each of the six sides is about 14,500 km long — longer than Earth's diameter (12,742 km). |
| Depth | About 300 km deep into Saturn's atmosphere. |
| Wind speed | About 320 km/h (200 mph) along the jet stream that forms the hexagon. |
| Rotation period | 10 hours, 39 minutes, 24 seconds — almost exactly the same as Saturn itself. |
| Inside the hexagon | A separate smaller hurricane-like storm sits at the very pole, with an eye about 2,000 km across. |
| South pole equivalent | None. Saturn's south pole has a hurricane-like vortex but no hexagon. |
| First spotted | Voyager 1 and 2 flyby images, 1980-1981. |
| First identified | David Godfrey, 1987 — by piecing together Voyager images. |
| Best studied by | Cassini, between 2006 and 2017. |
| Colour change | Cassini watched the hexagon shift from blue to gold between 2012 and 2016 — likely a seasonal sunlight effect. |
What is Saturn's hexagon?
Saturn's hexagon is a giant six-sided pattern in the clouds at Saturn's north pole. It is not a building or a structure — it is a shape made by moving air, the same way smoke rings are shapes made by moving air.
A fast band of wind, called a jet stream, flows around Saturn's north pole. For reasons scientists are still working on, that jet stream curves around in a six-sided shape instead of a circle.
As the wind moves, it pulls clouds along with it, and from above, the whole atmosphere looks like a giant hexagon drawn on top of the planet.
This is something that just does not happen on Earth. Storms on Earth are roughly circular — hurricanes spin in spirals, cyclones in ovals, never in straight-sided polygons. Jupiter's storms are similar: round or oval. Only Saturn does this trick, and only at its north pole. We will get to why.
Common myth: Saturn's hexagon is a single giant hurricane. Actually: it is a jet stream (a fast band of wind) flowing in a hexagonal shape.
There is a separate, smaller hurricane-like storm sitting at the very pole inside the hexagon, but that storm is much smaller. The hexagon itself is more like a six-sided racetrack of fast-moving air than a hurricane.
Who discovered Saturn's hexagon?
The hexagon was first photographed by NASA's Voyager 1 and Voyager 2 spacecraft when they flew past Saturn in 1980 and 1981. But neither flyby lasted long, and the cameras only saw the polar region for short periods at a time. The pictures came back to Earth showing strange straight edges in the clouds — but nobody quite worked out what they were looking at.
Six years later, in 1987, a British astronomer named David Godfrey did something clever. He went back through the Voyager pictures, carefully combined them together, and pieced together a full image of Saturn's north pole.
When all the partial views were fitted together properly, the hexagon appeared. The clouds were forming a near-perfect six-sided shape.
Godfrey's combined image is how we know about the hexagon today.
After that, no spacecraft visited Saturn for almost 20 years. The hexagon went uninvestigated until the Cassini spacecraft arrived at Saturn in 2004.
By 2006, Cassini was taking the best images of the hexagon anyone had ever seen. And in 2009, when sunlight finally returned to Saturn's north pole after the long polar winter, Cassini took the first colour photographs of the hexagon — the iconic images you see today.
When Cassini first started imaging Saturn's hexagon in 2006, it could only see in infrared, because the north pole was in the middle of a 15-year-long winter and the Sun had not risen there for years. The infrared camera measured the heat coming up from Saturn's interior, and the hexagon showed up clearly as a darker outline. The first true-colour pictures of the hexagon had to wait until January 2009, when sunlight finally hit the north pole again.
How big is Saturn's hexagon?
The hexagon is enormous. It is about 30,000 kilometres across — more than twice the width of Earth.
You could lay two Earths side by side inside the hexagon and still have room left over. Each one of its six straight sides is about 14,500 km long, which is more than the entire diameter of Earth.
So every single edge of the hexagon is longer than a planet.
The hexagon is also deep. It is not just a pattern in the very top of the clouds — it extends down into Saturn's atmosphere by about 300 kilometres.
That is roughly the same as the depth of Earth's entire weather system. So the hexagon isn't a surface decoration.
It is a full three-dimensional column of swirling, fast-moving air.
Imagine shrinking Saturn down to the size of a basketball. At that scale, the hexagon would still be bigger than a coin — and you would see all six sides clearly, drawn at the top of the ball. Now imagine the real thing: clouds, racing at over 300 km/h, tracing those same six sides every Saturn day. Forever.
Why is it a hexagon and not a circle?
This is the question that puzzled scientists for over 30 years. Storms on Earth are round. Hurricanes spin in spirals. Even the giant storms on Jupiter, the planet most like Saturn, are ovals. So why does Saturn's north pole show a perfect six-sided shape?
The answer has to do with how fast wind speeds change between latitudes. On Saturn, just south of the north pole, the wind speed changes dramatically over a very short distance — a fast band of wind sits right next to slower wind.
Scientists call this a steep wind gradient. When a fast band of wind moves through air that is moving much more slowly nearby, the wind path can bend and wobble.
Under the right conditions — speed, planet size, rotation rate — those wobbles lock into a perfect repeating pattern. On Saturn's north pole, the conditions happen to make six wobbles around the loop.
Six wobbles connected together make a hexagon.
Scientists are still working on exactly why six and not five or seven. The number depends on the wind speeds, Saturn's spin, and the size of the polar region.
Tweak any one of those slightly and the number of sides would change. Saturn's atmosphere happens to land right on six.
If conditions ever shifted significantly, the hexagon could become a pentagon or a heptagon — but it has stayed as a hexagon for at least the 40 years we've been watching.
Recreating the hexagon in a lab tank
How do you prove a theory about a planet you cannot visit? You build a tiny version of it on Earth.
That is exactly what scientists at the University of Oxford did. Around 2010, they set up a clever experiment: a circular tank of water on a spinning turntable, with a smaller ring at the centre spinning at a different speed.
The faster ring created a band of fast-flowing water, surrounded by slower-moving water — exactly the same situation as Saturn's polar jet stream.
When the team turned the rotation up to the right speed, something remarkable happened. The boundary between the fast and slow water did not stay round.
It locked into a polygon shape. Depending on how the rotation was set, the polygon had three, four, five or six sides.
They had recreated the same kind of process that makes Saturn's hexagon, in a water tank on a desk.
This was an extraordinary moment in planetary science. It showed that the hexagon is not magic — it is just fluid dynamics. The same physics that turns water in a spinning bowl into a polygon, scaled up by tens of thousands of kilometres and replacing water with hydrogen-helium gas, makes Saturn's hexagonal jet stream.
Jet stream: a fast-flowing river of air high up in a planet's atmosphere. Earth has jet streams too — they are what airplane pilots try to catch on long flights eastward, because they can push a plane along at hundreds of kilometres per hour. Saturn's polar jet stream is much, much faster than any on Earth.
The storm at the very pole inside the hexagon
Right in the middle of the hexagon, exactly at Saturn's north pole, sits something else: a giant rotating storm shaped like a hurricane. Its eye is about 2,000 kilometres across — wider than the United States — and its winds spin at over 500 km/h.
It looks remarkably like a hurricane on Earth, with a calm centre and a wall of fast-moving clouds around it. Unlike the hexagon, this storm is roughly circular.
So Saturn's north pole is actually two features in one. Around the outside: the hexagon, a six-sided jet stream that does not change.
In the middle: a hurricane-like storm that spins continuously at the very pole. The two have been sitting together for as long as we have been watching.
Saturn keeps both of them going at the same time.
Take a closer look at Saturn's atmosphere, stripes, and storms in general.
Why doesn't Saturn's south pole have a hexagon?
Here is one of the strangest things of all. Saturn has a north pole and a south pole, both very similar in most ways.
But only the north pole has the hexagon. The south pole has a hurricane-like vortex too — a big spinning storm with a clear eye — but its outer winds form a roughly circular pattern, not a six-sided one.
Why? Scientists are not completely sure.
The most likely answer is that the wind speeds and the steep wind gradient that lock into a hexagonal shape at the north pole are slightly different at the south pole — different enough that the conditions for a polygon never quite line up. The south pole's winds may also be too turbulent, or the gradient between fast and slow bands may be too gentle, for a clean polygon to form.
Could Saturn's south pole ever form a hexagon? Possibly, given the right combination of wind speeds and seasonal changes — but in the 40-plus years we have been watching, it has not.
Future spacecraft visiting Saturn (a mission after Dragonfly, perhaps, decades from now) may catch the south pole in a different state. For now, the asymmetry between Saturn's two poles is one of the great unsolved puzzles about our solar system.
Why did the hexagon turn from blue to gold?
Cassini watched Saturn for 13 years, from 2004 until 2017. And during the second half of the mission, between about 2012 and 2016, scientists noticed something strange happening at the north pole.
The hexagon, which had been a pale blue colour, slowly turned golden brown. The change was real — not a camera trick — and it covered the whole hexagonal region.
The most likely explanation is sunlight. Saturn has seasons just like Earth, but each Saturn season lasts about 7 Earth years.
During the long polar winter, the hexagon's clouds were hidden in darkness and stayed a cool blue. When the Sun started shining on the north pole again in the late 2000s, ultraviolet light from the Sun started changing the chemistry of the clouds — creating a golden haze of organic particles, much like the haze on Saturn's moon Titan.
As more sunlight reached the hexagon, more haze built up, and the colour shifted.
Explore the full Cassini-Huygens mission, year by year.
So what makes Saturn's hexagon so special?
Saturn's hexagon is special because everything about it sounds impossible. A perfect six-sided shape, formed by moving air, sitting at the top of a planet for at least 40 years and probably much longer.
Each side longer than a planet. Wide enough for two Earths to fit inside.
Winds racing along the edges at hundreds of kilometres per hour. And on Earth, in a lab in Oxford, scientists figured out how it works using nothing more than a tank of water and a spinning turntable.
Saturn keeps surprising us. Even when we think we understand a planet, it offers up a giant hexagon at its north pole and asks us to explain it. That is what makes Saturn the most decorated planet in the solar system — not just rings, but storms, hexagons, polar vortices, and a list of unanswered questions that gets longer every year.
- Saturn's hexagon is a giant six-sided cloud pattern at Saturn's north pole.
- It is about 30,000 km across — wide enough for two Earths to fit inside.
- Each side is about 14,500 km long — longer than Earth's diameter.
- It is about 300 km deep into Saturn's atmosphere.
- The hexagon is made by a fast jet stream moving at about 320 km/h.
- Voyager 1 and 2 first photographed it in 1980-1981. David Godfrey identified the full hexagonal shape in 1987.
- Cassini studied it in detail between 2006 and 2017.
- Scientists at Oxford recreated the same kind of polygon pattern in a rotating water tank around 2010.
- A separate hurricane-like storm sits at the very pole inside the hexagon.
- Saturn's south pole has a vortex but no hexagon — nobody fully knows why yet.
Saturn's hexagon — frequently asked questions
Quick answers to the most common hexagon questions.
What is Saturn's hexagon?
Saturn's hexagon is a giant six-sided cloud pattern at Saturn's north pole. It is about 30,000 km across, with six straight sides each longer than Earth's diameter. It is made by a fast jet stream — a band of wind moving at about 320 km/h — that loops around the north pole in a six-sided shape instead of a circle.
Why is Saturn's hexagon a hexagon?
Because of how wind speeds change between latitudes near Saturn's north pole. A fast band of wind sits right next to slower-moving air. When fast and slow wind meet in the right way, the boundary can wobble — and under Saturn's specific conditions, those wobbles lock into a perfect repeating six-sided pattern. Scientists recreated the same kind of process in a rotating water tank at Oxford around 2010.
How big is Saturn's hexagon?
About 30,000 km across — wide enough for two Earths to fit side by side inside it. Each of the six sides is about 14,500 km long, longer than Earth's diameter. The hexagon is also about 300 km deep into Saturn's atmosphere.
Who discovered Saturn's hexagon?
NASA's Voyager 1 and 2 spacecraft photographed it during their flybys in 1980 and 1981, but the early images only showed parts of it. In 1987, British astronomer David Godfrey pieced the Voyager pictures together and identified the full hexagonal shape for the first time.
Is Saturn's hexagon a hurricane?
Not exactly. The hexagon itself is a jet stream — a fast-flowing band of wind in a six-sided shape. There is a separate, smaller hurricane-like storm sitting at the very pole inside the hexagon, but the hexagon and the storm are two different features. The hexagon is more like a giant racetrack of fast air than a hurricane.
Does Saturn's south pole have a hexagon?
No. Saturn's south pole has a hurricane-like vortex with a giant eye, but its winds form a roughly circular pattern — not a hexagon. Scientists are still working out exactly why only the north pole has a hexagon.
How fast are the winds in Saturn's hexagon?
About 320 km/h (200 mph) in the hexagonal jet stream itself. The smaller hurricane-like storm at the very pole has winds spinning at over 500 km/h.
How long has the hexagon been there?
At least 40 years — it has been visible in every spacecraft observation since the Voyager 1 flyby in 1980. It is probably much older than that, but we did not have close-up images of Saturn's north pole before Voyager arrived.
Why did the hexagon change colour?
Cassini watched the hexagon shift from pale blue to gold between about 2012 and 2016. The most likely explanation is sunlight. When the long polar winter ended and the Sun started shining on Saturn's north pole again, ultraviolet light caused chemistry changes in the upper clouds, building up a golden haze of organic particles. Saturn's seasons are slow — each one lasts about 7 Earth years.
Could the hexagon ever disappear?
It could in principle — but it has been stable for at least 40 years, so no time soon. The hexagon depends on Saturn's wind speeds, rotation rate, and atmospheric structure. If those changed significantly, the shape could change too. For now, the hexagon is one of Saturn's most reliable features.
Does Jupiter or any other planet have a hexagon?
No. Saturn's hexagon is unique in our solar system. Jupiter has giant storms (like the Great Red Spot) but they are circular or oval, not polygonal. Neptune, Uranus and Earth all have polar weather features too — but none of them form a hexagon.
Mini quiz — test your hexagon knowledge
Try these without scrolling back up. (Answers below.)
- Which pole of Saturn has the hexagon — north or south?
- How many Earths could fit side by side across Saturn's hexagon?
- Roughly how fast are the winds in the hexagonal jet stream?
- Which two spacecraft first photographed the hexagon in the 1980s?
- Who pieced together the full hexagonal shape from those photos, and in what year?
- True or false: there is a separate hurricane-like storm sitting inside the hexagon at the very pole.
- Imagine if you were a pilot flying along one side of the hexagon at airliner speeds (around 900 km/h). About how long would one side take you to cross? (Hint: each side is about 14,500 km.)
- Challenge: scientists recreated the hexagon shape in a lab — what kind of equipment did they use?
1) The north pole.
2) Two Earths fit side by side inside the hexagon, with room to spare. (The hexagon is about 30,000 km across; Earth is about 12,742 km across.)
3) About 320 km/h (200 mph).
4) Voyager 1 (1980) and Voyager 2 (1981).
5) David Godfrey, a British astronomer, in 1987.
6) True — a hurricane-like storm with an eye about 2,000 km across sits at the very pole, inside the larger hexagonal jet stream.
7) About 16 hours. (14,500 km ÷ 900 km/h ≈ 16 hours.) Each side is so long that flying along just one of them at airliner speed would take longer than a flight from London to Sydney.
8) A rotating water tank with a faster-spinning inner ring — at the University of Oxford, around 2010. They recreated polygon-shaped flow patterns just by spinning the water at the right speed.
Teacher and parent notes
Hooks for using this page in lessons or homework time.
Curriculum links:
- UK KS2 Year 5 — Earth and Space: planets and their atmospheres; weather patterns on other worlds.
- UK KS3 Physics — forces in fluids; what happens when fluids of different speeds meet.
- US NGSS MS-ESS2 — Earth's atmospheric systems compared with other planets; weather and climate.
- Cross-curricular: maths (hexagon geometry — 6 sides, regular polygon, angle 120°), history of science (Voyager 1980-81 → Godfrey 1987 → Cassini 2006-2017), engineering (the rotating-tank lab experiment).
Talking-point prompts:
- "Why do you think storms on Earth are always roughly round, and never hexagonal?"
- "How could scientists prove a theory about a planet they can't visit? What is the value of a desk-scale lab experiment?"
- "If Saturn's north pole has a hexagon and the south pole doesn't, what could be different between them?"
Activity suggestions:
- Hexagon-tracing activity: use a compass to construct a regular hexagon (six equal sides, six equal angles of 120°). Label it as the cloud pattern at Saturn's north pole.
- Scale-model overlay: draw the hexagon to scale on graph paper, then draw an Earth-sized circle and check that two Earths fit side by side across the hexagon.
- Rotating-tank demonstration (older kids, supervised): a large bowl of water on a spinning lazy-Susan, with food colouring added at the centre, can show how rotating fluids form wave patterns — a kid-friendly hint at how the Oxford experiment worked.
More Saturn adventures
Pick what you want to explore next.
Saturn's atmosphere and storms
- Saturn's atmosphere, stripes, and storms — the bigger weather picture, beyond just the hexagon.
Missions that imaged the hexagon
- The Pioneer and Voyager flybys at Saturn — the first close looks at Saturn, including the hexagon.
- The Cassini-Huygens mission — 13 years studying Saturn, with the best hexagon photos ever taken.
Compare and explore
- Saturn vs Jupiter — the two big gas giants — Jupiter has the Great Red Spot but no hexagon. Why?
Observation
- How to spot Saturn tonight — you can't see the hexagon from Earth, but you can see Saturn.
Back to the main Saturn page
Sources and last updated
This page is fact-checked against current sources from NASA, ESA, and peer-reviewed planetary science research.
- NASA — Cassini mission archive, Saturn's north polar hexagon imaging pages, and 'Cassini Images Bizarre Hexagon on Saturn' (2007 press release).
- ESA — Cassini-Huygens mission scientific results pages.
- Godfrey, D. A. (1988) — A hexagonal feature around Saturn's north pole, Icarus 76, 335 (the original identification paper).
- Aguiar, A. C. B. et al. (2010), Icarus — laboratory simulation of polygonal flow patterns analogous to Saturn's hexagon, University of Oxford.
- Sánchez-Lavega, A. et al. (2014), Geophysical Research Letters — long-term tracking of the hexagon and its winds with Cassini data.
- NASA Hubble OPAL programme — ongoing Saturn imaging and seasonal monitoring.
Last updated: May 2026. Hexagon dimensions, wind speeds, depth and rotation period verified against NASA's Cassini archive (Cassini imaging-team publications and JPL press releases). Colour-change observations cross-checked with peer-reviewed Cassini-mission publications.
Written and fact-checked by the Planets for Kids editorial team.
Explore the Rest of Saturn
- Saturn Facts for Kids — The Complete Guide
- Saturn's Rings
- Saturn's Hexagon Storm
- Saturn's Seasons & Ring Cycle
- Saturn's Atmosphere
- How Saturn Formed
- Titan
- Enceladus
- Mimas
- Rhea
- Iapetus
- Pan, Daphnis & the Shepherd Moons
- Why Saturn Has So Many Moons
- Pioneer 11 & the Voyager Flybys
- The Cassini-Huygens Mission
- The Huygens Probe on Titan
- Dragonfly — Titan Quadcopter
- How to Observe Saturn
- Could Humans Live on Saturn?
- Saturn in Mythology
- Saturn vs Jupiter
- Saturn vs Earth
- For Teachers & Parents