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SESK: Stuff Everyone Should Know · sesk.info/astro-barred-spiral-arm-origin

Where do spiral arms usually begin in a barred spiral galaxy?

They usually begin at the ends of the central bar.

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  1. At the halo's edge
  2. At the ends of the bar ✔
  3. At random points in the disk

Why: A barred spiral contains an elongated central stellar structure. Its curved spiral arms generally extend from the bar's two ends.

Huh, didn't know that: The Milky Way itself is classified as a barred spiral galaxy.

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Spiral arms meet at the bar, but they only order starters.
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References

Answer: At the ends of the bar. A barred spiral contains an elongated central stellar structure. Its curved spiral arms generally extend from the bar's two ends.

  1. Types of Galaxies openstax.org/books/astronomy/pages/26-2-types-of-galaxies
    The spiral arms usually begin from the ends of the bar.
    Checked 2026-10-10.

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