About half of the galaxies in our universe are dead, but how exactly did that happen? How do galaxies die?

Why Are Most Galaxies Spiral Shaped?    • Why Are Most Galaxies SpiralShaped?  
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'Dead' Galaxy May Hide Dark Matter Surprise
http://www.seeker.com/deadgalaxymay...
"While measuring the speed of stars whirling around a nearby dwarf galaxy, astronomers have realized that a reservoir of dark matter may be lurking within."

Is our Milky Way galaxy a zombie, already dead and we don't know it?
http://phys.org/news/201601milkyga...
"Like a zombie, the Milky Way galaxy may already be dead but it still keeps going. Our galactic neighbor Andromeda almost certainly expired a few billion years ago, but only recently started showing outward signs of its demise."

Hubble Sees 'Ghost Light' From Dead Galaxies
https://www.nasa.gov/content/goddard/...
"NASA's Hubble Space Telescope has picked up the faint, ghostly glow of stars ejected from ancient galaxies that were gravitationally ripped apart several billion years ago. The mayhem happened 4 billion lightyears away, inside an immense collection of nearly 500 galaxies nicknamed "Pandora's Cluster," also known as Abell 2744."

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Written by: Trace Dominguez