- #1
TEFLing
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- 22
https://Earth'sky.org/space/new-map-confirms-four-milky-way-arms
The "minor" arms (Sagittarius & Outer) are more tightly wound. How can one spiral galaxy have more than one type of arm winding, aren't spirals classified according to a single degree of arm winding?
Are the more tightly wound arms, which evidently lack as many bright young stellar nurseries, older structures?
...four spiral arms. The arms are where most stars in the galaxy are born. They contain most of the galaxy’s gas and dust, the raw ingredients for new stars.
Two of the arms, called Perseus and Scutum-Centaurus, seem to be more prominent and jam-packed with stars, while the Sagittarius and Outer arms have as much gas as the other two arms but not as many stars.
Two of the arms, called Perseus and Scutum-Centaurus, seem to be more prominent and jam-packed with stars, while the Sagittarius and Outer arms have as much gas as the other two arms but not as many stars.
The "minor" arms (Sagittarius & Outer) are more tightly wound. How can one spiral galaxy have more than one type of arm winding, aren't spirals classified according to a single degree of arm winding?
Are the more tightly wound arms, which evidently lack as many bright young stellar nurseries, older structures?