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The Andromeda galaxy (M31) has in recent years been found to have an extended range of faint stars previously unseen, giving the galaxy an overall diameter of about 220,000 light years (~67.5 parsecs). This was roughly three time previous estimates.

What proves difficult in pegging a specific diameter is that galaxies do not have hard edges. The field of stars dwindles in density somewhat gradually. We have to define at what density of stars is a location no longer within the body of a galaxy. This definition would be rather arbitrary and could vary from person to person.

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