Hardly...
There is no one settled number of different types of galaxies, but there are many features that can be described in them.
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There are Irregular, Elliptical, Lenticular and Spirals... Among Spirals, you can also have bulges, bars, double bars, rings and variable numbers of arms.
http://en.m.wikipedia.org/wiki/Galaxy_morphological_classification
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Our own Milky Way galaxy is described as being:
• Double Barred
• Central Bulge
• Two primary spiral arms (Perseus and Scutum-Centaurus Arms)
• Two secondary arms (Norma and Outer Arms)
• Numerous tertiary arms and spurs, including the Orion Spur where our Sun lies.
http://en.m.wikipedia.org/wiki/Milky_Way
Well said smitty. It's good to remember that there are no real "types" or categories of any kind in nature. Nature exist in continua. We humans just develop categories and labels so that we can talk about what we see more easily.
Thanks and well said yourself. :)
Categories exist to make communication easier, particularly in scientific papers. They end up trying to use terms like it's a type X or a type Y feature... but it gets really interesting when it is neither and both and ends up described as a XYa II (b).
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I gotta say, I'm digging your screen name. A nickname worthy of an (online) science communicator... like The Bad Astronomer, The Noisy Astronomer and Bug Girl.
There is no one settled number of different types of galaxies, but there are many features that can be described in them.
.
There are Irregular, Elliptical, Lenticular and Spirals... Among Spirals, you can also have bulges, bars, double bars, rings and variable numbers of arms.
http://en.m.wikipedia.org/wiki/Galaxy_morphological_classification
.
Our own Milky Way galaxy is described as being:
• Double Barred
• Central Bulge
• Two primary spiral arms (Perseus and Scutum-Centaurus Arms)
• Two secondary arms (Norma and Outer Arms)
• Numerous tertiary arms and spurs, including the Orion Spur where our Sun lies.
http://en.m.wikipedia.org/wiki/Milky_Way
Categories exist to make communication easier, particularly in scientific papers. They end up trying to use terms like it's a type X or a type Y feature... but it gets really interesting when it is neither and both and ends up described as a XYa II (b).
.
I gotta say, I'm digging your screen name. A nickname worthy of an (online) science communicator... like The Bad Astronomer, The Noisy Astronomer and Bug Girl.