What is in the centers of galaxies?

According to observations of stellar velocities, it is assumed that in the centers of nearby galaxies M31 and M32 there are black holes with masses of 10 to 100 million Suns. In the center of our Galaxy there is also a compact object weighing about 4 * 10 ^ 6 solar masses. According to scientists, this is most likely a black hole, although the presence of a concentrated star cluster is possible.

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