Andromeda galaxy
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The Andromeda Galaxy is a Spiral Galaxy similar to the Milky Way, and situated within the same Galactic Cluster.
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 variables
- Eclipsing binary star[1]
- Measurement of brightness of individual stars and comparing to the distance to the Magellanic Clouds