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spiral tracers: Objects used to map the spiral arms (e.g., O and B associations, open clusters, clouds of ionized hydrogen, and some types of variable stars).
sporadic meteor: A meteor not part of a meteor shower.
spirals, accurate knowledge of the disk inclination and any warp present are crucial; M31 changes from a one-armed leading to 2-armed trailing spiral when its kinematic warp is taken into account. Galaxies with a sparse population of spiral tracers ...
 See also: Light, Avior, Infrared, Galaxy, Cluster
  
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