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 expandin...
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