Norma Arm
E21425
The Norma Arm is one of the major spiral arms of the Milky Way galaxy, rich in stars, gas, and dust and serving as a key site of star formation.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
spiral arm
→
structure in the Milky Way → |
| alsoKnownAs |
Norma-Cygnus Arm
→
Norma–Cygnus Arm → |
| connectsTo |
inner regions near the Galactic center
→
|
| contains |
H II regions
→
OB associations → dense star-forming regions → embedded protostars → giant molecular clouds → interstellar dust → interstellar gas → massive stars → molecular clouds → stars → stellar nurseries → young star clusters → |
| distanceFromSun |
several kiloparsecs
→
|
| galaxyTypeContext |
barred spiral galaxy
→
|
| hasKinematicProperty |
follows Galactic rotation curve
→
|
| hasProperty |
high concentration of cold molecular gas
→
major spiral arm → rich in dust → rich in gas → rich in stars → significant dust extinction → site of active star formation → traced by massive star-forming complexes → |
| hasSpiralPattern |
logarithmic spiral
→
|
| isTracedBy |
CO molecular line emission
→
maser sources → radio observations of hydrogen → |
| liesInDirectionOf |
Galactic longitude around 330 degrees (inner segment)
→
southern sky constellations including Norma → |
| locatedIn |
Milky Way disk
→
|
| namedAfter |
constellation Norma
→
|
| obscuredIn |
optical wavelengths by dust
→
|
| orientation |
roughly follows the Milky Way bar at its inner end
→
|
| partOf |
Milky Way
→
|
| positionInGalaxy |
inner region of the Milky Way
→
|
| roleInGalaxy |
contributes significantly to the Milky Way’s spiral structure
→
major site of star formation in the Milky Way → |
| studiedBy |
infrared astronomy
→
radio astronomy → |
| visibleIn |
infrared wavelengths
→
radio wavelengths → |
Referenced by (2)
| Subject (surface form when different) | Predicate |
|---|---|
|
Milky Way
→
|
contains |
|
Scutum–Centaurus Arm
→
|
separatedFrom |