cluster

A cluster means a group of things that are close together. In science, the word cluster is often used to describe groups of stars, galaxies, or atoms.

For example, a star cluster is a group of stars that are born together and that are gravitationally bound to each other. The Milky Way galaxy is a cluster of billions of stars. And atoms can form clusters called molecules.

Clusters can be small or large. A star cluster might contain just a few stars, while a galaxy might contain billions of stars. And a molecule might contain just a few atoms, while a protein might contain thousands of atoms.

Clusters are important because they can help us to understand the formation and evolution of stars, galaxies, and matter. For example, by studying star clusters, scientists can learn about how stars are born and how they evolve. And by studying galaxies, scientists can learn about the formation and evolution of the universe.

Imagine that you are a group of friends. You are all close together, and you do things together. You are like a cluster. In the same way, clusters of stars, galaxies, and atoms are all close together, and they interact with each other.

The grapes were clustered on the vine.