Spiral galaxies
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- Asternaut
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Re: Spiral galaxies
John: Here's a late answer to your June comment - if you're still checking: While spirals are numerous, galaxies come in various shapes - many ellipticals as well as others written about by Halton Arp in his books, Atlas of Peculiar Galaxies and another, Quasars, Redshifts and Controversies. Check also the book Galaxies by Tim Ferris.
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- G'day G'day G'day G'day
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Re: Spiral galaxies
G'day from the land of ozzzzz
Chris said
How do you explain the cartwheel galaxies?
Chris said
How do you explain the evolution of galaxies and their form as per the Hubble Tuning fork.Galaxies are not the product of any kind of explosion. They were formed when material came together by gravitational attraction. When that happens, conservation of angular momentum tends to result in motion on a plane. It's why galaxies are disc shaped, as well as why planets orbit stars on a plane.
How do you explain the cartwheel galaxies?
Harry : Smile and live another day.
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- Ontological Cartographer
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Re: Spiral galaxies
The 'Hubble Tuning Fork' is a classification system, it doesn't actually have anything to do with galactic evolution.
Don't just stand there, get that other dog!
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- Abominable Snowman
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Re: Spiral galaxies
The shape a galaxy has depends on its initial mass, age, and history of interaction with other galaxies. The Hubble classification tells us nothing about evolution, only about form. Elliptical galaxies are probably the most evolved, forming after multiple collisions and matter absorption events.harry wrote:How do you explain the evolution of galaxies and their form as per the Hubble Tuning fork.
Is there more than one? Like most galaxies with odd form, the Cartwheel formed from a galactic collision.How do you explain the cartwheel galaxies?
Chris
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Cloudbait Observatory
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Chris L Peterson
Cloudbait Observatory
https://www.cloudbait.com
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- Apathetic Retiree
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Re: Spiral galaxies
http://en.wikipedia.org/wiki/Galaxy_mor ... sificationharry wrote:How do you explain the evolution of galaxies and their form as per the Hubble Tuning fork.
http://chandra.harvard.edu/photo/2006/c ... index.htmlharry wrote:How do you explain the cartwheel galaxies?
http://chandra.harvard.edu/photo/2006/c ... /more.html
http://chandra.harvard.edu/edu/formal/cartwheel/
http://hubblesite.org/newscenter/archiv ... 2/image/a/
http://hubblesite.org/newscenter/archiv ... 6/36/text/