IAU descriptor term
Chaos in the Solar System
Chaos is the term planetary geologists use for terrain broken into a jumble of blocks and hollows. 39 named features carry it, across 2 of the 14 mapped worlds, the largest being Aurorae Chaos on Mars at 714 km.
Where they are
The largest chaos anywhere
Ranked across every mapped world, by catalogued diameter.
1Aurorae ChaosMars714 km2Chryse ChaosMars659 km3Hellas ChaosMars591 km4Eos ChaosMars498 km5Echus ChaosMars481 km6Goirias ChaosEuropa470 km7Iani ChaosMars451 km8Rathcroghan ChaosEuropa430 km9Hydraotes ChaosMars419 km10Leix ChaosEuropa415 km11Margaritifer ChaosMars384 km12Aureum ChaosMars351 km13Hydaspis ChaosMars336 km14Dinrigh ChaosEuropa335 km15Aram ChaosMars284 km16Nilus ChaosMars283 km17Galaxias ChaosMars235 km18Aeolis ChaosMars201 km19Arsinoes ChaosMars200 km20Atlantis ChaosMars181 km21Pyrrhae ChaosMars162 km22Gorgonum ChaosMars151 km23Erythraeum ChaosMars148 km24Conamara ChaosEuropa144 km25Murias ChaosEuropa116 km26Ganges ChaosMars114 km27Ister ChaosMars109 km28Caralis ChaosMars103 km29Aromatum ChaosMars72.8 km30Baetis ChaosMars66.7 km
What they are named after
Naming themes are set per world, so one descriptor can draw on very different sources depending on where it sits. Across all 39 chaos, 4 categories appear.
Greek16Latin13Celtic9Turkey1