There's another Milky way out there

The video discusses the principle of mediocrity in astronomy, suggesting that the Milky Way may not be as unique as previously thought. It explores the structure of the Milky Way, highlighting its thick and thin discs and their different metallicities. The video also examines the possibility of the Milky Way forming from a collision of two galaxies, a theory challenged by new observations of a similar galaxy, UGC 10738. Additionally, the discovery of the oldest known spiral galaxy, BRI-1335-0417, is presented, raising questions about the formation and evolution of spiral galaxies.

What new insight or understanding did you gain from this video?