Galaxies
A galaxies is a huge mass of stars, nebulae, and intersteller material . The smallest galaxies contain about 100,000 stars, while the largest contain about 3,000 billion stars. There are three main types of galaxies , classified according to their shapes : elliptical, which are oval shaped ; spiral ,which have arms spiralling outwards from a central bulge ; and irregular , which have no obvious shape. The radition from active galaxies and quasars is thought to be caused by black holes .
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