1 zettametre

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The zettametre (SI symbol: Zm) is a unit of length in the metric system equal to 1021 metres.[1]

To help compare different orders of magnitude, this page lists distances starting at 1 Zm (1021 m or 110,000 light years).

Distances longer than 1 Zm

Distances longer than 10 Zm

See also[edit]


  1. ^ "SI Brochure: The International System of Units (SI)". International Committee for Weights and Measures. Organisation Intergouvernementale de la Convention du Mètre. Retrieved 11 October 2014.