The black circle in the middle of the iris in your eye is called a pupil. It dilates to adjust with sunlight.
It's called the pupil.
It is the pupil.
The pupil is in the center of the iris.
pupil
Pupil
Pupil
Pupir
There is no black hole in our solar system.It is believed, however, that there is a black hole at the center of the Milky Way Galaxy, and that there are black holes at the center of every galaxy.
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.'
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.
A singularity is at the centre of a black hole.
The small opening of the iris in the eye is the pupil.
There is no black hole in our solar system.It is believed, however, that there is a black hole at the center of the Milky Way Galaxy, and that there are black holes at the center of every galaxy.
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.
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.
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.
ALL larger galaxies have a black hole in their center.
The center of a black hole, a locus of infinite density where matter is compressed into zero volume, is called a 'singularity.'