Zettametre

A zettametre (American spelling: zettameter, symbol: Zm) is a unit of length equal to 10²¹ metres.

Zettametres could be used for measuring intergalactic distances, but astronomers have been long accustomed to use light-years and parsecs instead.

• 1 Zm is equal to 105700 light-years or 32408 parsecs
• the diameter of our galaxy is about 1.0 Zm
• distance to the Large Magellanic Cloud is 1.6 Zm
• distance to the Andromeda Galaxy is 22.3 Zm
• distance to the "Black Eye Galaxy" is 160 Zm

exametre << zettametre << yottametre

See also

• 1 E21 m
• SI
• SI prefix
• Orders of magnitude