Chapter 2. The Origin of Earth and the Solar System

Earth appears as a deep blue sphere showing the continent of Africa. The foreground is rough terrain on the moon.
Figure 2.1 Earthrise, October 12, 2015. The Lunar Reconnaissance Orbiter Camera captured images of the lunar surface with Earth in the background. Source: NASA Lunar Reconnaissance Orbiter Science Team (2015) Public Domain. view source

The story of how Earth came to be is a fascinating contradiction. On the hand, many things had to go just right for Earth to turn out the way it did, and for life to develop. On the other hand, the formation of planets similar to Earth is an entirely predictable consequence of the physical and chemical processes taking place around stars. In fact, it has happened more than once.

This chapter starts Earth’s story from the beginning—the very beginning—to explain why, for billions of years, generations of stars had to be born and then die explosive deaths before Earth could exist. How stars form and burn, and affect the objects around them are fundamental to Earth’s story, as is the rough neighbourhood in which Earth spent its early years.

Chapter Goals

Complete this chapter so you can:

  • Explain the big bang theory for the origin of the universe.
  • Explain how clouds of gas floating in space can turn into stars and planets.
  • Describe the types of objects that are present in our solar system, and why they exist where they do.
  • Explain how Earth got its layered structure, water, and atmosphere.
  • Explain how the moon formed.
  • Compare and contrast our solar system with other planetary systems.


Share This Book