Paul
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Most of the known spiral galaxies fall into this "barred" category - which are defined by the pronounced bar structure across their centres.
The presence of this structure may be an indication of a galaxy's age.
Two-thirds of nearby, younger galaxies have the bar, while only a fifth of older, more distant spirals have it.
Rest of article http://www.bbc.co.uk/news/science-environment-16856812
Another of my hobbies.
Most of the known spiral galaxies fall into this "barred" category - which are defined by the pronounced bar structure across their centres.
The presence of this structure may be an indication of a galaxy's age.
Two-thirds of nearby, younger galaxies have the bar, while only a fifth of older, more distant spirals have it.
Rest of article http://www.bbc.co.uk/news/science-environment-16856812
Another of my hobbies.