Black Hole
A black hole is a theoretical entity predicted by the equations of general relativity. A black hole is formed when a star of sufficient mass undergoes gravitational collapse, with most or all of its mass compressed into a sufficiently small area of space, causing infinite spacetime curvature at that point (a singularity). Such a massive spacetime curvature allows nothing, not even light, to escape from the event horizon or border.
Only one black hole is present in Sirius, located in Omicron-85. If the star has a low mass for a black hole, they can become Neutron Stars. Several theories have been made on the stars of Omega-11 and New Berlin, if they would become black holes or neutron stars, or if they will just collapse forming a black object.
