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Three methods enumerated and more percise distance
The '''Andromeda Galaxy''' is a [[Spiral Galaxy]] similar to the [[Milky Way]], and situated within the same [[Galactic Cluster]].
The '''Andromeda Galaxy''' is a [[Spiral Galaxy]] similar to the [[Milky Way]], and situated within the same [[Galactic Cluster]].
It is situated about 2.5 million light years from the Milky Way.{{fact-scientific}}
It is situated about 2.51 ± 0.13 million light years from the Milky Way.
The number 2.51 million light years has been reached through three separate methods for determining the distance to an astronomical object.
# [[Cepheid variable]]s
# Eclipsing [[binary star]]<ref>http://adsabs.harvard.edu/abs/2005ApJ...635L..37R</ref>
# Measurement of brightness of individual stars and comparing to the distance to the Magellanic Clouds
==References==
<references/>
[[Category:Astronomy]]