Title text:
The sun and the moon appear the same size in the sky, even though in real life the sun is more than twice as big. Some call this lucky alignment coincidence; others say it’s proof that sometimes things can be the same size.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3301/
There are more atoms in a single molecule of water than stars in the entire solar system.