Dark Nebula
Example: Horsehead Nebula
A dense cloud of cold gas and dust that blocks the light behind it, visible only as a dark silhouette.
Key facts
- How it shines
- It doesn’t; it blocks light
- Made of
- Cold, dense gas and dust
- Example shown
- Horsehead Nebula (Barnard 33)
- Example’s distance
- About 1,400 light-years
About the Dark Nebula
How to recognise it
Dark nebulae are so thick with dust that they block light from stars and glowing gas behind them. You see them as dark shapes against a brighter background.
The example: the Horsehead Nebula
The Horsehead Nebula, also known as Barnard 33, is a cold, dark cloud of gas and dust in the constellation Orion, about 1,400 light-years away. It is silhouetted against the glowing nebula IC 434, which gives it its famous horse’s-head outline.
Sources
Facts checked: 29 October 2026
