Beyond our world, what exits out there? How big is the universe? What is it like? How did it begin? What is it made of? This is the story of our journey to understand the incredible vastness of the universe and the billions and billions of galaxies it comprises, each with billions and billions of stars. It is the story of Cosmology.

Horizons is produced by Bibliotheca Alexandrina, and featured on ACMi with permission from Dr. Ismail Serageldin.