Physics Ontology

One map of physics, three ways in. Drill down on any quantity to see its units, the equations it lives in, and how its values span the universe.

← Back to all quantities
1 ly1\,\mathrm{ly}
Fundamental Constants

Light Year

Distance light travels in one year.

SI unit

metre (m)

Dimension: [ L ][\,L\,]

Other units

  • metre (m)

Defined value

Fixed constant from the A-level data sheets.

9.46 × 1015 m

AQA data sheet value