The answer is probably that these blue stars are also old and glow blue, reaching relatively high temperatures by the advanced process of fusing helium , rather than hydrogen , in their cores. Elliptical galaxy M87 is a type of galaxy that looks much different than our own Milky Way Galaxy . But even for an elliptical galaxy M 87 is peculiar. M87 is much bigger than an average galaxy, appears at the center of a whole cluster of galaxies known as the Virgo Cluster, and shows a very high number of globular clusters . These globular clusters are visible as faint spots surrounding the bright center of M87.
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