Overview

Galaxies are the grand cities of the universe - vast islands of stars, gas, dust, and dark matter stretching across millions of light-years. They spin, collide, grow, and fade, shaping everything we know about the cosmos. For centuries they were only faint smudges in the sky, but today we can map their arms, measure their age, and explore their brilliant cores. Inside this book, you will: Discover 15 real galaxies - from our Milky Way and its neighboring systems to the colossal giants and the strange ring-shaped Hoag's Object. Learn the basics of galaxies in simple, clear language suitable for adults and curious young readers alike. Explore more than 40 full-color images taken by NASA, ESA, Hubble, and other observatories, showing spirals, ellipticals, rings, and even the farthest galaxy ever observed. Understand how galaxies form, evolve, and interact, including collisions, mergers, and the mysterious dark matter that holds them together. See the universe through scale and time, from nearby galaxies only thousands of light-years across to GN-z11, which existed when the universe was less than 5 percent of its current age. Written with clarity and wonder, 15 Galaxies That Changed Our Understanding of the Universe takes you across cosmic distances to explore the great structures that fill the universe - showing how galaxies are born, how they live, and how they shape everything around us.

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