This is how the narrator describes the content in this particular video:

In this “How This Universe Works” video documentary, we are going to take you through a journey across the universe where you can learn about the different galaxies in the universe or otherwise Alien Galaxies.

By watching this video, you can learn about the galaxies in the universe, alien galaxies, number of galaxies of the universe, largest galaxy in the universe, information about all the galaxies in the universe, etc.

What do you think is the most likely star or galaxy to host alien life?  And should we look to Alpha Centauri as the closest star to us t around 4 light years away?  Feel free to comment with your ideas.