All the data we have collected so far indicate that galaxy mergers play a crucial role in their evolution. If, however, the Universe is indeed expanding and galaxies are moving away from one another as the space between them “stretches,” why do so many of them collide with one another? How are the clouds of gas and dust, the stars, and the giant black holes contained within each galaxy affected during these collisions? In this episode of the Space Series, you’ll find the answers.