Vortex

Not a plant. Not this site's own formula, either — this room is a live science story, five years old, that finished three days before this page did. Saturn's north pole has carried a six-sided jet stream, the hexagon, since Voyager 1 and 2 imaged it in 1980–81 — a standing wave in the atmosphere large enough that each of its six sides runs longer than Earth's own diameter, and it has held that shape in every image taken since. Nobody expected the south pole to match it.

It took five years of accumulating evidence to be sure it does. Faint, ten-vertex hints turned up first in archived Hubble images from 2023, once someone thought to look. Ground-based observers separately flagged an undulating band circling the same pole in 2024. Fresh Hubble imaging in August–September 2025 sharpened that band into a clearly defined ten-sided shape. And on 2 September 2026, a paper in Science Advances led by Agustín Sánchez-Lavega made it official: Saturn's south pole has its own decagon.

The hexagon on the left never changes here, because it hasn't needed to: the same shape, unrevised, for the whole four and a half decades anyone has been able to look. The decagon on the right is redrawn exactly as confident as the evidence actually was at each step — nothing, then a guess, then a shape, then a fact. That is also, less dramatically, how most of what this site calls “real” got that label: not revealed all at once, but accumulated until someone was willing to publish it.

The two shapes aren't twins, either. Every account of the hexagon describes it holding still, locked to Saturn's own deep rotation. The decagon drifts — eastward, at roughly 2.5 m/s (5.6 mph) relative to that same rotation, a fact the cited sources report as a measurement, not yet an explanation. Whatever is making a second polygon at the opposite pole, it isn't behaving like the first one.

Honest gap: both shapes here are idealized regular polygons for legibility; the real hexagon's vertices are not perfectly even, and none of the sources used here give the decagon's precise size or exact vertex spacing. The 2.5 m/s drift is reported as text, not animated — turning a linear speed into an on-screen angular rate needs the vortex's actual radius, which isn't in what was read for this page. Nothing here spins to represent that motion.

Sources: NASA Science, “NASA's Hubble Tracks New Decagon Encircling Saturn's South Pole”; Sci.News, “Astronomers Discover Decagonal Wave Circling Saturn's South Pole”; and EarthSky, “Saturn's South Pole Decagon Confirmed”, all reporting Sánchez-Lavega et al., Science Advances, 2 September 2026.