Introduction

Did you know that right now, you’re moving through space at over 2.2 million km per hour? 
 

• Earth orbits the Sun at 107,000 km/h.

• The Sun orbits the Milky Way at 828,000 km/h.

• Our galaxy itself is speeding through the universe at 1.3 million km/h!

 
Galaxies are some of the most fascinating and complex structures in the universe. With over 200 trillion of them scattered across the cosmos, each galaxy tells a story of formation, evolution, and interaction. In this module, we’ll explore what galaxies are, how they form, how they change over time, and how they fit into the larger cosmic web.