Links
- Wikipedia
- Oberon on Wikipedia
Oberon
Details
Oberon is the outermost and second-largest of Uranus' major moons. Voyager 2 found an old, heavily cratered surface, dark material on crater floors, and a mountain rising about 6 kilometers above the surrounding terrain.
Oberon matters because it sits at the edge of the familiar Uranian moon system. It is the outermost of Uranus' five major moons and the second largest, large enough to anchor the family with Titania but distant enough that Voyager 2 still saw it as a world with many unanswered surface details.
What Voyager 2 did show was an old, heavily cratered moon. NASA describes Oberon as similar to Umbriel in its cratering, with little sign of internal activity compared with Ariel, Titania, and Miranda. Its surface also carries dark material on many crater floors and at least one mountain rising about 6 kilometers above the terrain.
That is why Oberon belongs on this scale. It is not only another icy satellite near Titania's size; it is the outer boundary of the classical Uranian moon set, a cratered archive where impact history, dark deposits, and limited spacecraft coverage make the moon feel both substantial and still underexplored.
666km
Key facts
- Scale fact
- 1,523 kmdiameter
- Composition
- Water ice and silicate rock
Scale context
Where Oberon sits on the full axis
Shared physical scale
2,065km
Together, these objects make the size change around Oberon easy to compare at a glance.
Sources
References for Oberon
Measurements and descriptive context are compiled by the Scale of Space team from the references below. If you find an error, please let us know.
- Oberon — Wikipedia
- Visual reference: NASA Science (USGS / Tammy Becker / JPL-Caltech, Public domain)
Between the smallest and the largest, perspective is everything.
About
Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.
Guides turn parts of that scale into curated essays, while focused views let you explore the same range through specific groups of objects.