Astronomers discover more than 800 dark galaxies in the famous ComaCluster

"These galaxies appear diffuse and remarkably extended as seen by the
light of the stars they contain. Many are similar in size to the Milky
Way but have only 1/1,000 of the stars that our galaxy does. The stellar
population within such fluffy extended galaxies is subject to rapid
disruption due to a strong tidal force detected within the cluster.
Something invisible must be protecting the fragile star systems of these
galaxies, something with a high mass. That "something" is likely an
excessive amount of dark matter. The component of visible matter, such
as stars, is calculated to contribute only 1 percent or less to the
total mass of each galaxy. The rest — dark matter — accounts for more
than 99 percent."

Astronomers discover more than 800 dark galaxies in the famous Coma
Cluster | Astronomy.com
http://www.astronomy.com/news/2015/0...s-coma-cluster

In article ,
Yousuf Khan writes:
Astronomers discover more than 800 dark galaxies in the famous Coma
Cluster | Astronomy.com

The press release, somewhat more informative than the _Astronomy_
article, is at:
http://subarutelescope.org/Pressrele.../22/index.html

A preprint of the scientific paper is at:
http://arxiv.org/abs/1506.01712

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