Carina–Sagittarius Arm: Difference between revisions

The '''Carina–Sagittarius Arm''' (also known as the '''Sagittarius Arm''' or '''Sagittarius–Carina Arm''', labeled '''-I'''{{clarify|date=April 2023|reason=What is this "-I" label meant to indicate?}}) is generally thought to be a minor [[spiral arm]] of the [[Milky Way]] [[galaxy]].<ref name=Churchwell2009/> Each spiral arm is a long, diffuse curving streamer of [[star]]s that radiates from the [[galacticGalactic centerCenter]]. These gigantic structures are often composed of billions of stars and thousands of gas clouds. The Carina–Sagittarius Arm is one of the most pronounced arms in our galaxy as many [[HII region]]s, young stars and [[giant molecular cloud]]s are concentrated in it.<ref name="

The Milky Way is a [[barred spiral galaxy]], consisting of a central crossbar and bulge from which two major and several minor spiral arms radiate outwards. This arm lies between two major spiral arms, the [[Scutum–Centaurus Arm]], the near part of which is visible looking ''inward'', i.e. toward the galacticGalactic centreCenter with the rest beyond the galactic central bulge, and the [[Perseus Arm]], similar in size and shape but locally much closer looking outward, away from the bright, immediately obvious extent of the Milky Way in a perfect observational sky.<ref name=Churchwell2009>{{cite journal|last=Churchwell|first=Ed|author2=Babler, Brian L. |author3=Meade, Marlin A. |title=The Spitzer/GLIMPSE Surveys: A New View of the Milky Way|journal=Publications of the Astronomical Society of the Pacific|year=2009|volume=121|issue=877 |pages=213–230|doi=10.1086/597811|url=http://www.astro.wisc.edu/sirtf/Churchwell_2009.pdf|format=pdf|bibcode=2009PASP..121..213C}}</ref> It is named for its proximity to the [[Sagittarius (constellation)|Sagittarius]] and [[Carina (constellation)|Carina]] constellations as seen in the [[night sky]] from Earth, in the direction of the [[galacticGalactic centerCenter]].

The arm dissipates near its middle, shortly after reaching its maximal angle, viewed from ourthe solarSolar systemSystem, from the galacticGalactic centreCenter of about 80°. Extending from the galaxy's central bar is the '''Sagittarius Arm''' (Sagittarius bar). Beyond the dissipated zone it is the '''Carina Arm'''.<ref name=Churchwell2009/>

[[File:Milky Way Sagittarius Arm.jpg|In front of, above and below the Galactic CentreCenter much visible dust appears from the Scutum-Centaurus Arm, some dust and nebulae in the Sagittarius Arm and many stars and objects from our own arm.|thumb]]

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