One of those planets was .
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. the universe and the earth 7th class pdf
You can copy and paste this text into a PDF or a document to save as a PDF. Chapter 1: The Beginning of Everything One of those planets was