Size+or+Scale

https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/scale-small-large-tutorial/v/scale-of-the-small

https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/scale-small-large-tutorial/v/scale-of-the-large

Onion used to show size of atoms and scale. https://www.youtube.com/watch?v=yqLlgIaz1L0