Level 1 — Absolute Beginner
Saturn is a big planet in space. It has rings around it.
Saturn's north pole has a strange shape in its clouds. It looks like a hexagon, a shape with six sides.
Now scientists found a new shape. It is at Saturn's south pole. It has ten sides.
Scientists used a space telescope called Hubble to see it. They are very surprised by this discovery.
- planet
- a large round object in space that orbits a star
- pole
- the very top or bottom point of a planet
- hexagon
- a shape with six straight sides
- telescope
- a tool used to see far away objects in space
- discovery
- something new that is found for the first time
- cloud
- here, gas high in a planet's atmosphere
- surprised
- feeling wonder because something was not expected
- shape
- the outer form of something
Level 2 — Elementary
Saturn has long been known for the strange, hexagon shaped cloud pattern that swirls around its north pole. For decades, scientists thought this six sided shape was completely unique among the planets.
Now, using images collected by the Hubble Space Telescope over several years, astronomers have confirmed something new: a giant ten sided shape, or decagon, slowly circling Saturn's south pole. The wave is enormous, stretching roughly one hundred four thousand miles across.
Scientists first spotted faint hints of the pattern in images from 2023. Later, in 2024, researchers and skilled amateur astronomers noticed a faint, wavy band near the south pole, and observations gathered in 2025 gave stronger evidence that it had grown into a clear decagon.
The discovery is exciting because it changes how scientists think about Saturn. The decagon moves slowly eastward, drifting through one of the planet's jet streams, unlike the northern hexagon, which stays fixed in place relative to the planet's rotation.
- hexagon
- a six sided shape
- decagon
- a ten sided shape
- unique
- the only one of its kind
- amateur astronomer
- a person who studies space as a hobby, not as a job
- jet stream
- a strong, fast moving band of air or gas high in an atmosphere
- rotation
- the spinning motion of a planet around its own axis
- drift
- to move slowly, often carried by wind or current
- pattern
- a repeated or regular arrangement of something
Level 3 — Intermediate
For decades, Saturn's north polar hexagon, a strikingly regular six sided jet stream pattern first documented by the Voyager missions, was treated as a singular curiosity among the solar system's gas giants. New evidence gathered by the Hubble Space Telescope has now overturned that assumption, revealing a comparably vast decagonal wave encircling the planet's south pole.
The finding, published in the journal Science Advances, traces its origins to archival Hubble images captured in October 2023, which showed a faint ten vertex polygon near 63 degrees south latitude. Subsequent observations in 2024 by researcher Agustin Sanchez-Lavega alongside amateur astronomers Trevor Barry and Jean-Paul Oger detected a faint, wavy band in the same region, and ground based observations collected in 2025 provided stronger confirmation that the feature had matured into a well defined decagon spanning roughly one hundred four thousand miles.
Crucially, the decagon behaves differently from its northern counterpart. While the hexagon remains essentially stationary relative to Saturn's interior rotation rate, the decagon drifts eastward at approximately 2.5 meters per second, or about 5.6 miles per hour, relative to the planet's radio determined rotation period, suggesting it behaves as an evolving atmospheric wave rather than a fixed structural feature.
Researchers say the discovery upends the long standing assumption that the northern hexagon was a one of a kind phenomenon and raises the possibility that large, regular sided polar jet stream patterns may be a more general feature of gas giant atmospheres than previously believed, prompting renewed interest in re-examining archival data from Jupiter, Uranus, and Neptune for similar, previously overlooked structures.
- singular curiosity
- something unusual and considered to be the only one of its kind
- archival
- relating to older, stored records or data kept for future reference
- vertex
- a point where two or more lines or edges of a shape meet
- latitude
- a measurement of distance north or south of a planet's equator
- stationary
- not moving; staying in one place
- counterpart
- a thing that corresponds to or matches another in a different context
- atmospheric
- relating to the layer of gases surrounding a planet
- overlooked
- not noticed or given attention, often by mistake
Level 4 — Advanced
Saturn's north polar hexagon, the remarkably regular six sided jet stream feature first documented during the Voyager flybys and studied extensively by Cassini, had long stood as an apparent anomaly among the solar system's gas giants. Newly published analysis of Hubble Space Telescope imagery has now dislodged that assumption, confirming a comparably expansive decagonal wave enveloping Saturn's southern polar region.
The finding, detailed in Science Advances, traces its provenance to archival Hubble frames from October 2023 that revealed a faint ten vertex polygon centered near 63 degrees south latitude. Follow up work in 2024 by planetary scientist Agustin Sanchez-Lavega, in collaboration with amateur observers Trevor Barry and Jean-Paul Oger, identified a subtle, undulating band in the same region, and ground based observations amassed through 2025 corroborated that the structure had coalesced into a well defined decagon spanning roughly one hundred four thousand miles, a scale comparable to the planet's northern counterpart.
Kinematically, the two features diverge in a scientifically significant way. Whereas the hexagon remains effectively locked to Saturn's interior rotation rate, exhibiting negligible drift over decades of observation, the decagon migrates eastward at approximately 2.5 meters per second relative to the planet's radio determined rotation period, behavior more consistent with an evolving wave propagating within a jet stream than with a static, dynamically anchored structure.
The implications extend well beyond Saturn itself. By dislodging the presumption that the northern hexagon represented a singular atmospheric curiosity, the discovery reframes such large, polygonal, regular sided polar jet features as a potentially generalizable phenomenon among giant planet atmospheres, prompting planetary scientists to revisit decades of archival imagery from Jupiter, Uranus, and Neptune in search of comparable, previously unrecognized structures that earlier analyses may have dismissed as noise or transient artifacts.
- anomaly
- something that deviates from what is standard or expected
- provenance
- the origin or source of something, especially data or evidence
- undulating
- moving in a smooth, wave like manner
- corroborate
- to confirm or support a claim with additional evidence
- kinematically
- relating to the motion of objects, without regard to the forces causing it
- propagate
- to spread or travel outward through a medium
- generalizable
- able to be applied broadly beyond a single specific case
- transient artifact
- a temporary, misleading signal in data that does not reflect a real, lasting feature
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