How big is the Milky Way Galaxy?
Our galaxy contains over 200 billion stars, most of which are arranged in a disc containing a core and spiral arms. This disc is about 100 thousand light years across, but is only about 1000 light years thick. A small percentage of the stars are distributed around the Halo, which is a spherical cloud marking the boundaries of the galaxy. The halo completely envelops the disc, and is also home to many globular clusters.
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