These come from cold material close to the central black hole.
The standard game fills the entire board with pegs except for the central hole.
This is the most popular theory for the extraction of energy from the central black hole.
Its characteristic emission lines are produced by gas moving at high speeds around the central black hole.
Long arrows of glass pointed inward from the frame toward the central hole.
The analysis indicates that the X-rays are coming from a very small region, about the size of the solar system, around the central black hole.
There it will deliver its payload into the massive central black hole.
First a bite from the outside of the dish is dipped into the central hole with syrup.
Another very specific mat has a circular shape with a central hole the size of a head.
More generally, these feature a central hole, usually just below the collar bones.