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Homunculus Nebula
Details
The Homunculus Nebula is the compact bipolar ejecta around Eta Carinae, blown out during the Great Eruption of the 1840s. Its twin lobes and thin equatorial skirt preserve that stellar outburst in unusually sharp, small-scale form.
The Homunculus Nebula is what happens when a stellar outburst leaves behind a structure too young and too crisp to dissolve into background cloud. Wrapped tightly around Eta Carinae, it is the ejecta of the nineteenth-century Great Eruption, still close enough to the star that the event feels physically present rather than remote.
Its shape is the point. The two opposing lobes and thin equatorial skirt show that the eruption was not a diffuse puff of gas but a strongly directed expulsion of matter. Because the nebula is so young, much of that geometry still reflects the original outflow rather than later mixing with the wider Carina environment.
The Homunculus is therefore one of the clearest compact records of extreme stellar mass loss. It shows that a massive star can erupt, shed a nebula of its own, and leave behind a remnant whose form still preserves the violence of the event.
2,043billion km0.22ly
Visual creditNathan Smith (University of California, Berkeley), NASA / ESA / Public domainSource: Wikimedia Commons
Key facts
- Category
- Nebulae
- Object class
- Bipolar nebula
- Composition
- Ionized gas, dust, stellar ejecta
- Scale fact
- 5,500 billion km0.58 lymaximum extent
- Estimated age
- ~180 years
- Host
- Eta Carinae system
Scale context
Where Homunculus Nebula sits on the full axis
By size on the journey, Homunculus Nebula sits between Cat's Eye Nebula and Ring Nebula. The band below uses nearby Nebulae objects for context.
Shared physical scale
7.15ly
Together, these objects make the size change around Homunculus Nebula easy to compare at a glance.
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.