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Helix Nebula
Details
The Helix Nebula is one of the closest planetary nebulae to Earth, a glowing shell expelled by a dying Sun-like star. From Earth it can look like a simple doughnut, but the full structure is a layered remnant built from two nearly perpendicular gaseous disks and outflows.
The Helix Nebula is one of the closest and best-studied planetary nebulae, and it looks deceptively simple at first glance. From Earth it can resemble a doughnut, yet the Hubble-and-ground-based composite shows that the object is really a large, structured envelope of gas that needed more than one telescope to capture in full.
New evidence suggests that the Helix contains two gaseous disks that are nearly perpendicular to one another. That kind of geometry hints that the dying star may have had a companion, or at least that the final mass loss was shaped by more than one axis of motion. The result is a nebula whose apparent symmetry hides a more complicated internal architecture.
That is why the Helix Nebula matters. It turns a late stage of stellar evolution into something visible and physically readable, showing how a Sun-like star can shed its outer layers and leave behind a remnant that is beautiful precisely because it is not simple.
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Visual creditNASA, ESA, C.R. O'Dell (Vanderbilt University), M. Meixner and P. McCullough (STScI) / Public domainSource: NASA Science
Key facts
- Category
- Nebulae
- Object class
- Planetary nebula
- Host
- Milky Way
- Scale fact
- 5.6 lydiameter
- Composition
- Ionized gas, dust, cometary knots
Scale context
Where Helix Nebula sits on the full axis
By size on the journey, Helix Nebula sits between Oort Cloud and Crab Nebula. The band below compares Helix Nebula with nearby Planetary nebula objects so the size jump stays easy to read.
Shared physical scale
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Together, these objects make the size change around Helix 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.