|
gptkbp:instanceOf
|
astronomer
|
|
gptkbp:cataloguedIn
|
gptkb:Messier_catalog
gptkb:Sharpless_catalog
|
|
gptkbp:composedOf
|
ionized hydrogen
|
|
gptkbp:contains
|
dust
young stars
interstellar gas
|
|
gptkbp:createdBy
|
ultraviolet radiation from young massive stars
|
|
gptkbp:density
|
low
|
|
gptkbp:discoveredBy
|
gptkb:William_Huggins
|
|
gptkbp:emits
|
gptkb:radio_waves
visible light
|
|
gptkbp:example
|
gptkb:Orion_Nebula
gptkb:Eagle_Nebula
gptkb:Lagoon_Nebula
|
|
gptkbp:foundIn
|
galaxies
|
|
gptkbp:frequency
|
forbidden lines of oxygen
hydrogen alpha
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
H II regions
|
|
gptkbp:importantFor
|
star formation
|
|
gptkbp:lifespan
|
a few million years
|
|
gptkbp:relatedTo
|
supernova remnants
planetary nebulae
|
|
gptkbp:shape
|
irregular
|
|
gptkbp:size
|
up to hundreds of light-years across
|
|
gptkbp:studiedBy
|
astronomer
|
|
gptkbp:temperature
|
about 10,000 K
|
|
gptkbp:bfsParent
|
gptkb:M33
gptkb:Cygnus_Arm
gptkb:Cygnus_X_region
gptkb:Large_Magellanic_Cloud
gptkb:Scutum-Centaurus_Arm
gptkb:Scutum–Centaurus_Arm
gptkb:Small_Magellanic_Cloud
|
|
gptkbp:bfsLayer
|
6
|