Mysteries: Stars at Galactic Core
Once the centre of our Milky Way was a mystery. In the constellation Sagittarius, the core is permanently hidden by clouds of gas. Only very recently have radio astronomers penetrated to the core. After decades of observations they are certain that the centre is a massive Black Hole.
Equally surprising, astronomers have found thousands of stars orbiting in the core. More than 100 OB and Wolf-Rayet stars have been found that appear to have formed just a few milion years ago. Old theories of star formation can not explain how these stars exist. The immense tidal forces and radiation of the core should have torn them apart.
The Arches Cluster is in the left photo and the Quintuplet cluster to the right. The Hubble Space Telescope has found star clusters weighing 10,000 solar masses less than 100 light years from the galactic centre. These are 10 times bigger than typical star clusters in the Milky Way, exactly the reverse of what astronomers suspected. By old theories of cosmology the huge clusters should have been ripped apart.
If primordial Black Holes are involved, stars could form around them even near the galactic core. Presence of singularities would prevent the stars from breaking up. Hidden central Black Holes could also explain the massive star clusters near the core. If one Black Hole can exist in the core, why not many?