You can copy and paste this text into a PDF or a document to save as a PDF. Chapter 1: The Beginning of Everything
Long ago, before there was time, space, or a single star, there was nothing. Not even empty space. Then, about 13.8 billion years ago, something miraculous happened: . the universe and the earth 7th class pdf
Fast-forward billions of years to a quiet corner of a spiral galaxy we call the . A medium-sized, yellow star was born—our Sun . Around it swirled a disk of gas and dust. In this disk, tiny dust grains stuck together like snowballs, growing into pebbles, then boulders, then mountains, and finally planets. You can copy and paste this text into
Today, you live on a 4.5-billion-year-old planet. Your body is made of stardust—carbon from that ancient supernova. You are protected by a thin blue sky. Beneath your feet, a molten core churns. And above you, the universe continues to expand, filled with a hundred billion galaxies, each with a hundred billion stars. Then, about 13