In this chapter you learnt about the Earth, its Solar System, and the galaxy beyond.

You have understood:

• The different gasses that make up the Earth’s atmosphere
• What causes the change from day to night, and from one season to the next
• Solar and lunar eclipses – what they are, when they take place, and why
• Why the moon appears to change shape over the course of a month
• The Big Bang theory of how the Earth began
• What makes up outer space, from stars and their constellations, to the Milky Way, to the mysteries of black holes