Question

what is nebula in spiral arm

Answer 1

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Spiral galaxies form a class of galaxyoriginally described by Edwin Hubble in his 1936 work The Realm of theNebulae and, as such, form part of the Hubble sequence. Most spiral galaxies consist of a flat, rotating disk containing stars, gas and dust, and a central concentration of stars known as the bulge.

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Answer 2

The most striking features of any spiral galaxy are the two or more spiral arms sweeping out from either the central bulge or the ends of the galactic bar. ... It is now thought that spiral arms arise due to the passage of a density wave around a spiral galaxy.