The Virgo Cluster spans more than 5 degrees on the sky - about 10 times the angle made by a full Moon . It contains over 100 galaxies of many types - including spirals , ellipticals , and irregular galaxies. The Virgo Cluster is so massive that it is noticeably pulling our Galaxy toward it. The cluster contains not only galaxies filled with stars but also gas so hot it glows in X-rays . Motions of galaxies in and around clusters indicate that they contain more dark matter than any visible matter we can see.
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