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, the Razgriz Black Hole located in Omicron Phi. If the star has a low mass for a black hole, they can become Neutron Stars. Several theories have been made on the star New Berlin, if they would become black holes or neutron stars, or if it will just collapse forming a black object.
Getting close to the event horizon will result in nearly instant death.
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