The black circle in the middle of the iris in your eye is called a pupil. It dilates to adjust with sunlight.
At the center of a black hole is a mass that has collapsed to an infinitely dense point.
The center of a black hole, a locus of infinite density where matter is compressed into zero volume, is called a 'singularity.'
There is not a black hole at the center of the Canis Major constellation. Canis Major is a constellation in the night sky and does not have a physical center like a galaxy that could potentially contain a black hole.
The center of a black hole is called a singularity, where a huge amount of matter is crushed into a single point. That's scary, isn't it?
Perhaps you are confusing Universe with galaxy. Most galaxies have a black hole in their center. The Universe has no such thing as a center.
The hole in the center of the iris through which light can pass is called the pupil.
A singularity is at the centre of a black hole.
They are hollow so light can pass through to the retina, so you can see. The pupil is the opening in the iris. To ask why the eyes' pupils are hollow is analogous to asking why a donut hole is hollow.
Not all galaxies have a black hole at their center. Some galaxies, like our own Milky Way, do have a supermassive black hole at their center, while others do not.
No, the sun does not orbit a black hole in the center of our galaxy. The sun orbits around the center of the Milky Way galaxy, where there is a supermassive black hole called Sagittarius A.
the name of the hole that allows light to go through into your eye is: pupil
It seems that just about EVERY galaxy has a huge ("supermassive") black hole in its center.
every galaxy got a black hole in the center even our galaxy, the milky way.
It is believed that all galaxies have a black hole at their centers.
singularity
A blazar is an elliptical galaxy with a supermassive black hole at the center.
At the center of a black hole is a mass that has collapsed to an infinitely dense point.