Galaxies are the building blocks of the universe from "summary" of The Mysteries of the Universe by Will Gater
The universe is a vast and mysterious place, filled with countless stars, planets, and other celestial objects. At the heart of this vast cosmic tapestry are galaxies, immense collections of stars, gas, and dust bound together by gravity. These galaxies come in a variety of shapes and sizes, from spirals like our own Milky Way to irregular and elliptical forms. Galaxies are not just random collections of stars; they play a crucial role in the structure and evolution of the universe. In fact, galaxies are often referred to as the building blocks of the universe because they are the fundamental units from which larger structures, such as galaxy clusters and superclusters, are formed. These structures, in turn, are the framework around which the universe is organized. One of the key reasons galaxies are considered the building blocks of the universe is their sheer number. Estimates suggest that there are billions of galaxies in the observable universe, each containing...
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