1 zettametre

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

1.7 Zm — 179,000 light years — Distance to the Large Magellanic Cloud, largest satellite galaxy of the Milky Way
2.0 Zm — 210,000 light years — Distance to the Small Magellanic Cloud
2.8 Zm — 300,000 light years — Distance to the Intergalactic Wanderer, one of the most distant globular clusters of Milky Way
8.5 Zm — 900,000 light years — Distance to the Leo I Dwarf Galaxy, farthest known Milky Way satellite galaxy

Distances longer than 10 Zm

References

↑ "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.

SI units of length

From smallest to largest (left to right). Commonly used units shown in bold italics.

yoctometre (1×10⁻²⁴ m) zeptometre attometre femtometre picometre nanometre micrometre millimetre centimetre decimetre metre (m) decametre hectometre kilometre megametre gigametre terametre petametre exametre zettametre yottametre (1×10²⁴ m)

Orders of magnitude for length by powers of 10

One metre (10⁰) and shorter	< −12 −12 −11 −10 −9 −8 −7 −6 −5 −4 −3 −2 −1 0

Longer than one metre	1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 <