Sky science
Planetary Nebula
Direct answer
Planetary Nebula: A Planetary Nebula is an ionized shell expelled by a dying low-to-intermediate-mass star around its exposed hot core.
It is a glowing stellar envelope, not a planet-forming cloud.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Stellar Black Hole, Supernova, Emission Nebula, Reflection Nebula
It is a glowing stellar envelope, not a planet-forming cloud.
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The story behind Planetary Nebula
Planetary Nebula’s misleading name arose because early telescopes showed some examples as small planet-like disks.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Planetary Nebula matters
Planetary Nebula shows how stars like the Sun return enriched material to interstellar space.
Planetary Nebula in practice: an example
Ultraviolet light from the hot remnant makes the ejected gas emit characteristic colors.
Where readings of Planetary Nebula go wrong
A planetary nebula is short-lived astronomically and unrelated to planets.
Sources and editorial method
Research references used for this entry include:
- NASA Science: Stars - NASA overview of stellar birth, main-sequence evolution, giant phases, remnants, and supernovae.
- NASA Science: Universe Glossary - NASA definitions for common stellar, galactic, orbital, and high-energy astronomy terms.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
Look inside a planetary nebula
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More in Astronomy & Skywatching
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- Spectral Type
- Van Allen Radiation Belts
- Astronomical Nadir
- Celestial Horizon
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- Hyperbolic Orbit
- Neutron Star
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Common questions
What is a Planetary Nebula?
A Planetary Nebula is an ionized shell expelled by a dying low-to-intermediate-mass star around its exposed hot core.
What do people get wrong about a Planetary Nebula?
A planetary nebula is short-lived astronomically and unrelated to planets.
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