Perseus Arm
E20156
The Perseus Arm is one of the major spiral arms of the Milky Way galaxy, rich in gas, dust, and star-forming regions.
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
spiral arm
→
structure in the Milky Way → |
| contains |
Cassiopeia OB associations
→
H II regions → IC 1805 (Heart Nebula) → IC 1848 (Soul Nebula) → NGC 1499 (California Nebula) → NGC 281 (Pacman Nebula) → NGC 7538 → Perseus OB associations → Perseus molecular cloud complex → W3 star-forming region → W4 star-forming region → W5 star-forming region → embedded star clusters → giant molecular clouds → massive young stars → numerous young stellar objects → open star clusters → supernova remnants → |
| distanceFromSun |
approximately 2 kiloparsecs
→
approximately 6,500 light-years → |
| extendsOver |
large range of Galactic longitudes
→
|
| galacticQuadrants |
spans first and second Galactic quadrants
→
|
| galaxyTypeContext |
barred spiral galaxy
→
|
| hasComponent |
cold dense molecular gas
→
dust lanes → warm ionized gas → |
| isOneOf |
four major spiral arms of the Milky Way
→
|
| liesInside |
Outer Arm
→
|
| liesOutside |
Orion Arm
→
|
| locatedIn |
Milky Way disk
→
Orion–Cygnus region of the Milky Way → |
| namedAfter |
constellation Perseus
→
|
| observedIn |
infrared wavelengths
→
optical wavelengths (in parts) → radio wavelengths → |
| orientation |
roughly follows Galactic rotation
→
|
| partOf |
Milky Way
→
|
| positionRelativeToGalacticCenter |
outer spiral arm
→
|
| richIn |
interstellar dust
→
interstellar gas → molecular clouds → star-forming regions → |
| roleInGalaxy |
site of active star formation
→
|
| structureType |
major spiral arm
→
|
| tracedBy |
maser parallax measurements
→
radio observations of CO emission → radio observations of neutral hydrogen → |