The Milky Way is an example of a spiral galaxy. It is a galaxy in
which several "arms" seem to unwind from a central region. Another example of a spiral
galaxy is the Andromeda Galaxy, located in the constellation Andromeda.
The youngest stars and most of the gas and dust are located in the arms of a spiral
galaxy. Since the hottest stars burn out quickly, whenever we see a hot star (which can be
recognized by its blue colour), it must be relatively young. Colour photographs of galaxies
show that the central regions are relatively yellow, indicating that older stars are
dominant there, while the arms are relatively blue and therefore contain relatively young
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