TIL despite its depiction in diagrams, the entire asteroid belt has about as much mass as 4 percent of the moon.

https://www.astronomy.com/science/why-hasnt-the-asteroid-belt-formed-a-planet/

https://www.reddit.com/r/todayilearned/comments/165y0nm/til_despite_its_depiction_in_diagrams_the_entire/