Good question! The answer, THIS week, is "galaxies".
However, we don't know how much hydrogen there is in intergalactic space; for all we know, there's more free hydrogen between the galaxies than there is in all the stars. Alternatively, we might argue that most of the matter has already fallen into various black holes, or exists in some impossible-to-detect "dark matter". We know a tiny fraction of one-thousandth of one percent of everything that we need to know - and discovering all those answers will be the work of the next several thousand years.
A group of stars that are closer together than the surrounding stars is called a star cluster. Star clusters can be divided into two main types: open clusters and globular clusters, with open clusters being more loosely bound than globular clusters.
There are 35 galaxies in the so-called "Local Group" The three largest galaxies are the Milky Way (our own), and the Andromeda and Triangulum galaxies. However, most of the visible stars we see are part of the Milky Way and two nearby dwarf galaxies, the "Small Magellanic Cloud" and the "Large Magellenic Cloud". There are 10 other dwarf galaxies near the Milky Way.
When DNA is clumped together, it takes on a condensed and compact structure known as chromatin. In this state, DNA is wrapped around proteins called histones to form nucleosomes, which then further coil and condense to form chromosomes. This condensed structure allows DNA to be packed efficiently within the cell nucleus.
bunches
Planetesimal formation.
It's called a mat. Or matted hair.
Galaxies that travel together through space are called galaxy groups or galaxy clusters. These are systems of galaxies bound together by gravity.
A group of stars that are closer together than the surrounding stars is called a star cluster. Star clusters can be divided into two main types: open clusters and globular clusters, with open clusters being more loosely bound than globular clusters.
There are 35 galaxies in the so-called "Local Group" The three largest galaxies are the Milky Way (our own), and the Andromeda and Triangulum galaxies. However, most of the visible stars we see are part of the Milky Way and two nearby dwarf galaxies, the "Small Magellanic Cloud" and the "Large Magellenic Cloud". There are 10 other dwarf galaxies near the Milky Way.
A spherical bulge of closely packed stars is called a globular cluster. These clusters are typically found in the outer regions of galaxies and contain thousands to millions of stars held together by gravity. Globular clusters are some of the oldest structures in the universe.
They are called "Star Clusters".
A clump. Unless they have undergone compaction and cementation in a process known as lithification. Then they would be classified as a sedimentary rock, maybe conglomerate, breccia, or sandstone.
Two consonants together are called a consonant cluster. In English, consonant clusters can be found at the beginning, middle, or end of words.
The Universe
Ah, happy little galaxies floating out there in the universe, clustered together like good old friends. What holds them together is something called gravity - it's like a gentle force that pulls all those beautiful galaxies towards each other. Just imagine each galaxy hugging the next one in a cosmic embrace, creating harmony in the vastness of space.
Clusters of stars that all appear to lie at the same distance from us are called star clusters. There are two main types: open clusters, which contain young stars and are loosely bound together, and globular clusters, which contain older stars and are tightly packed.
They are called photosystems. Photosystems are groups of chlorophyll molecules and associated proteins that work together to absorb and transfer light energy during the process of photosynthesis.