This makes it the most massive companion star in a binary system containing a black hole.
Some astronomers believe that active nuclei contain large black holes.
The piece of wood contains a little hole, in which the feather is sheathed.
The center of the cylinder contains a hole to insert a thermometer.
The cemetery wall is said to still contain holes made by musket balls.
The mountain contains a black hole of undetermined age.
In 1999 a violent X-ray outburst revealed it to contain a black hole.
It contains a supermassive black hole inside the center.
It contains a 16,000 light year wide hole.
It contains stars, gas, dust, dark matter and a supermassive black hole at its centre.