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It does not 'appear to be' 2.5 million light years away. Its distance has been determined by *three* completly independant methods, and they all say 2.5 million light years.
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 appears to be situated about 2.5 million light years from the Milky Way, meaning that the light from it that we see now must have left about 2.5 million years ago, giving rise to the [[starlight problem]]. It is on a collision course with the Milky Way.{{fact-scientific}} Luckily, since galaxies are mostly empty space, galactic collision damage is fairly low.{{fact-scientific}}
It is situated about 2.5 million light years from the Milky Way.{{fact-scientific}}