Exploring Galaxies: A Journey Through the Milky Way and Beyond

The video tutorial explains that galaxies are vast collections of gas, dust, and stars, with our Milky Way containing over 100 billion stars. It describes the three main types of galaxies: spiral, elliptical, and irregular, highlighting the structure of our spiral galaxy. The concept of a light year, the distance light travels in one year, is also introduced.

What are the three primary shapes of galaxies?

What is a light year?