Universe is full of galaxies from "summary" of A Short History of Nearly Everything: Special Illustrated Edition by Bill Bryson
It is a staggering fact that the universe is teeming with galaxies. Galaxies are vast collections of stars, planets, gases, and dust that are bound together by gravity. The Milky Way, our own galaxy, is just one of billions of galaxies in the universe. Each galaxy contains billions or even trillions of stars, along with countless other celestial bodies. The sheer number of galaxies in the universe is mind-boggling. Astronomers estimate that there are at least 100 billion galaxies in the observable universe. Each of these galaxies is unique, with its own distinct shape, size, and composition. Some galaxies are spiral-shaped, like the Milky Way, while others are elliptical or irregular in shape. Galaxies are not evenly distributed throughout the universe. Instead, they are clustered together in vast structures called galaxy clusters. These clusters can contain hundreds or even thousands of galaxies, all bound together by gravity. The largest structures in the universe are superclusters, which are made up of multiple galaxy clusters. The universe is constantly expanding, and as it does, galaxies are moving away from each other. This phenomenon, known as cosmic expansion, was first discovered by astronomer Edwin Hubble in the 1920s. Hubble observed that galaxies are receding from us at speeds proportional to their distance, leading to the conclusion that the universe is expanding. Despite the vast number of galaxies in the universe, the majority of the universe is actually empty space. Galaxies are separated by vast distances, with huge expanses of empty space between them. Even within galaxies, the space between stars is immense. If you were to shrink the Earth down to the size of a grain of sand, the nearest star would be over 100 meters away. The study of galaxies is a fascinating field of astronomy that continues to reveal new insights into the nature of the universe. By studying the properties and behavior of galaxies, astronomers are able to learn more about the origins and evolution of the universe as a whole. The universe truly is full of galaxies, each one a unique and awe-inspiring testament to the grandeur of the cosmos.
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