A prefix meaning one sextillion (1,000,000,000,000,000,000,000 or 1021)
The same as multiplying by 1021
Prefix is Z
Our Milky Way Galaxy is about 1 Zm (1 zettameter) across.
Example: 12 Zm = 12 zettameters = 12 sextillion meters (12,000,000,000,000,000,000,000 m)
Here we see sizes from the very small (quarks) to the observable universe:
