This video is about why the night sky is dark. The sky is only blue during the day because sunlight scatters
off our Earth's atmosphere, so how about if we didn't have an atmosphere? We would think that because of all the stars in the galaxy, their light should brighten the sky, but this video explains what actually occurs.
I found this very interesting because it connected conceptual physics ideas that we have already learned about in the past (Universe Expanding, Doppler Effect) to explain a very intriguing question that I never really thought much about before this.
Hope you enjoy!