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gptkbp:instanceOf
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Astronomical object
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gptkbp:cataloguedIn
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gptkb:Abell
gptkb:NGC
PK
IC
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gptkbp:centralTo
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White dwarf
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gptkbp:compatibleWith
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Planets
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gptkbp:composedOf
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Ionized gas
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gptkbp:contains
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gptkb:Nitrogen
gptkb:Oxygen
gptkb:Carbon
gptkb:Hydrogen
gptkb:Helium
Heavy elements
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gptkbp:discoveredBy
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gptkb:William_Herschel
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gptkbp:distanceFromEarth
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Hundreds to thousands of light-years
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gptkbp:emits
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Ultraviolet radiation
Visible light
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gptkbp:example
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gptkb:Dumbbell_Nebula
gptkb:Helix_Nebula
gptkb:Ring_Nebula
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gptkbp:expansion
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20–30 km/s
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gptkbp:firstObserved
|
18th century
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gptkbp:formedBy
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Dying star
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gptkbp:foundIn
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gptkb:Milky_Way
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https://www.w3.org/2000/01/rdf-schema#label
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Planetary nebula
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gptkbp:importantFor
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Chemical enrichment of interstellar medium
Stellar evolution studies
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gptkbp:lifespan
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10,000 to 20,000 years
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gptkbp:massLoss
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Stellar wind
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gptkbp:nameOrigin
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Resembles planet through small telescope
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gptkbp:numberInMilkyWay
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~3,000 known
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gptkbp:observedBy
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gptkb:Hubble_Space_Telescope
Ground-based telescopes
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gptkbp:phaseOf
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Late stellar evolution
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gptkbp:precededBy
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White dwarf stage
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gptkbp:shape
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Spherical
Bipolar
Elliptical
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gptkbp:studiedBy
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Astronomers
Galactic chemical evolution
Nucleosynthesis
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gptkbp:type
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gptkb:planetary_nebula
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gptkbp:bfsParent
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gptkb:Titan
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gptkbp:bfsLayer
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5
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