Estrellas y galaxias: galaxias

The video explores the vastness of space, starting with Earth's smallness in the universe. It discusses distances to nearby celestial bodies like Venus and Proxima Centauri, and provides an overview of our solar system. The concept of galaxies is introduced, focusing on the Milky Way, and concludes with a definition of the universe, encompassing all galaxies, matter, time, and energy.

What holds a galaxy together?

What is the composition of our galaxy?