# Are there small voids of 10 - 20 megaparsecs also within, and not only between superclusters?

I sincerely apologize if this question is stupid, however after all the articles I read so far, I could not confirm this assumption, which I think is actually a fact, but I'm not completely confident.

I'm writing on the topic of proportions of the universe, and in one of the statements I claim the following:

"Just one small void inside a supercluster of galaxies can span across 10 to 20 megaparsecs (32 to 65 million light-years ) in diameter."

Let me state that I understand that a void within a galaxy supercluster may not necessarily be completely surrounded by galaxies of that supercluster, and can extend far out from the supercluster it partially occupies, so to clarify what I mean by my question on a practical example:

If you were to draw a straight line across a map of a galaxy supercluster, can that line start inside a group of galaxies of that supercluster, go across a void of 10 - 20 megaparsecs, and end inside another group of galaxies of that same supercluster?

(I am basing my "small" classification of a cosmic void 10 - 20 megaparsecs in diameter on the Wikipedia article "Void (Astronomy)" https://en.wikipedia.org/wiki/Void_(astronomy) in which it says:

" ...Voids typically have a diameter of 10 to 100 megaparsecs; particularly large voids, defined by the absence of rich superclusters, are sometimes called supervoids. ..."

My only goal is basically to find out whether I would be wrong or not if I state that small voids of 10 - 20 megaparsecs, really actually exist within, and not only between superclusters.

For any eventual help on this topic, I would be sincerely grateful.

Kind regards

My only goal is basically to find out whether I would be wrong or not if I state that small voids of 10 - 20 megaparsecs, really actually exist within, and not only between superclusters.

The largest structure is called a filament.

We are in the supercluster Laniakea, in the smaller supercluster Virgo, in the Milky Way galaxy, in the Solar system, on Earth.

It looks like this:

$$\text{Click to zoom in - 23,624 × 2,953 pixels}$$ $$\text{Laniakea}$$

Here we are:

Wikipedia says:

Distribution: cosmic voids and sheets

Research has tried to understand the way superclusters are arranged in space. Maps are used to display the positions of 1.6 million galaxies. Three-dimensional maps are used to further understand the positions of these superclusters. To map them three-dimensionally, the position of the galaxy in the sky as well as the galaxy's redshift are used for calculation. The galaxy's redshift is used with Hubble's law to determine its position in three-dimensional space.

It was discovered from those maps that superclusters of galaxies are not spread uniformly across the universe but they seem to lie along filaments. Maps reveal huge voids where there are extremely few galaxies. Some dim galaxies or hydrogen clouds can be found in some voids, but most galaxies are found in sheets between the voids. The voids themselves are often spherical but the superclusters are not. They can range from being 100 million to 400 million light-years [that's 30.660139381 to 122.64055752 megaparsec] in diameter. The pattern of sheets and voids contains information about how galaxy clusters formed in the early universe.

There is a sponge analogy used often that compares a sponge to the pattern of clusters of galaxies in the universe – the holes are the voids and the other parts are the locations of the superclusters.".

So, yes - there are small and large voids.