The quettametre measures astronomical distances at a cosmic scale, representing 10³⁰ metres. It is used in cosmology to describe the diameter of the observable universe or the vast voids between superclusters of galaxies. One quettametre is equivalent to over 100 billion light-years, making it the ultimate upper bound for spatial measurement in the SI system. The symbol is Qm.
Heard on the job
The simulation maps the cosmic web across a volume several quettametres wide.