Spiral & Barred Spiral Galaxies15.6 - Be able to classify galaxies using the Hubble classification system, including:
b) barred spiral
These are flattened disc galaxies consisting of a nucleus of stars from which spiral arms extend.
There are two types:
- Spiral Galaxies. The spirals arms wind around the nucleus.
- Spiral Barred (or Barred Spiral) The spirals extend from a bar through the nucleus.
Typically older stars are nearer the nucleus while younger stars are further out in the spiral arms.