Which celestial object is explicitly mentioned as exhibiting a blueshift due to approaching the observer?
Answer
Andromeda Galaxy
While cosmological expansion causes distant galaxies to exhibit redshift, the phenomenon of blueshift—where light waves are compressed as an object moves toward the observer—is typically seen only on local scales where local gravitational interactions overcome the universe's expansion. The text specifically names the Andromeda Galaxy as an example of an object exhibiting a blueshift because it is gravitationally bound to the Milky Way and is currently moving toward our own galaxy. This observation confirms that while the universe expands generally, local structures can still exhibit relative motion toward one another.
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