Zettametre
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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